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Windows Server 2025 Installation Guide – Complete Step-by-Step Setup for Mini PCs

HYSTOU M9 WiFi 6 BT5.2 2.5G LAN Dual Band Connectivity
Microsoft Windows Server 2025 logo on a dark blue background, featuring a glowing light blue circular border and the text "Microsoft Windows Server 2025".

Table of Contents

  1. Before You Begin – What You Need to Know
  2. Preparation – Download ISO & Tools
  3. Step 1: Create a Bootable USB Drive with Rufus
  4. Step 2: Boot from USB and Enter Setup
  5. Step 3: Install Windows Server 2025
  6. Step 4: Install Device Drivers
  7. Step 5: Activate Windows Server 2025
  8. Troubleshooting & FAQ

Before You Begin – What You Need to Know

Who Is This Guide For?

This tutorial is designed for beginners who want to install Windows Server 2025 on a HYSTOU mini PC or any compatible x86-64 desktop/server hardware. No prior server administration experience is required — just follow the five steps in order.
Whether you are setting up a small-business server, a home lab, or an edge computing node, this guide walks you through the entire process from scratch.

Prerequisites at a Glance

ItemDetails
Target OSWindows Server 2025 Standard (Desktop Experience)
USB Flash Drive1 × 16 GB or larger (USB 3.0 recommended)
Working PC1 × internet-connected computer (Windows or macOS)
Required SoftwareWindows Server 2025 ISO image (~7.9 GB) + Rufus (free)
Estimated Time40–60 minutes (excluding download time)
Target DeviceHYSTOU mini PC or compatible system with UEFI boot support

Three Concepts to Understand First

  1. Bootable USB drive: You will “write” the ISO image onto a USB flash drive, turning it into a bootable installation disc. During setup, the target machine boots from this USB instead of its internal hard drive.
  2. A clean install erases all data: The installation process will delete every partition on the target disk. Make sure no important files remain on the drive before you begin.
  3. Windows Server vs. regular Windows: Windows Server is a server-class operating system. After installation, the desktop looks similar to Windows 10/11, but it does not include the Microsoft Store or consumer apps by default. Only editions labeled “Desktop Experience” include a graphical interface — the Server Core variant offers a command-line-only environment and is not recommended for beginners.

Important: This guide assumes you are installing on a brand-new machine or that all data on the target drive has already been backed up. Always back up before proceeding!

Preparation – Download the Windows Server 2025 ISO and Rufus

What You'll Need

MaterialQuantityPurposeNotes
USB Flash Drive1 (≥ 16 GB)Create bootable installation mediaWill be formatted — do not store important files on it; USB 3.0 for faster writes
Internet-connected PC1Download ISO and create bootable USBWindows or macOS
Windows Server 2025 ISO1 (~7.9 GB)Installation source fileDownload link below
Rufus1 (free)Write ISO to USBPortable app — no installation needed
Target host1Machine to install the OS onUEFI boot support recommended

Download the Windows Server 2025 ISO Image

  1. Open the official Microsoft distribution page for Windows Server ISOs: 
    https://massgrave.dev/windows-server-links
  2. Locate the Windows Server 2025 section and click the download link.
  3. On the download page, select English as the language and choose the edition you need, then click Download.

    Recommended edition: Windows Server 2025 Standard (Desktop Experience) — ideal for most small-business and single-server scenarios.

  4. Wait for the download to complete (~7.9 GB). Verify the file size matches the value shown on the page to ensure the download is complete.

Download Rufus (Bootable USB Creator)

  1. Visit the official Rufus website:

    https://rufus.ie/en

  2. Click the Download button at the top of the page to get the latest version (e.g., rufus-4.x.exe).
  3. No installation required — simply double-click the .exe file to launch Rufus.

Step 1: Create a Bootable USB Drive Using Rufus

Warning: This step will format your USB drive and erase all data on it. Confirm that no important files are stored on the drive before continuing.

1.1 Select Your USB Drive and ISO File

  1. Insert the USB flash drive into your working computer’s USB port and open Rufus.
  2. In the “Device” dropdown, select your USB flash drive. Verify by checking the drive letter and capacity.
  3. Click “Select” next to “Boot selection” and browse to the downloaded Windows Server 2025 ISO file. Rufus will automatically detect the image and display “Windows Server 2025.”
  4. Set the following options:
    • Partition scheme: GPT
    • Target system: UEFI (non-CSM)
    • Leave all other settings at their defaults.
  5. Click “START” at the bottom.

1.2 Configure and Wait for Completion

  1. When the “Windows User Experience” dialog appears, check options 1 and 2, then configure additional options as needed.
  2. A second warning will confirm that all data on the USB drive will be destroyed. Click “OK” to proceed.
  3. Watch the progress bar at the bottom. It will change from orange to green, and the status will display “READY” when the process is complete.
  4. Safely eject the USB drive using the system tray icon (“Safely Remove Hardware”).

Note: After creating the bootable USB, the drive will show less available space than its original capacity. This is normal — the ISO has been written to the drive. To restore the USB for regular use, reformat it through Disk Management.

Step 2: Boot from USB and Enter the Windows Setup

2.1 Access the Boot Menu on Your Mini PC

  1. Insert the bootable USB drive into the target HYSTOU mini PC.

    Tip: Use a rear USB port for better compatibility.

  2. Press the power button to turn on the machine.
  3. Immediately and repeatedly tap the F11 or F7 key on your keyboard (tap rapidly — do not hold the key). The exact key varies by BIOS manufacturer:
    • AMI BIOS: F7
    • Phoenix / Award BIOS: F11
    • HYSTOU default: F11
  4. When the Boot Menu appears, stop pressing the key. If the system boots normally or shows a black screen, restart and try again more quickly.

2.2 Select the USB Drive from the Boot Menu

  1. In the Boot Menu, use the arrow keys to find the entry with the “UEFI:” prefix, for example:
    • UEFI: USB DISK 2.0 PMAP
    • UEFI: SanDisk 16GB
  2. Press Enter to select it. The system will boot from the USB drive.
  3. You will see the blue “Windows Setup” loading screen — this confirms a successful boot.

Important: You must select the option that starts with “UEFI:” (matching the GPT partition scheme used by Rufus). If no UEFI entry appears, see FAQ Q2 for troubleshooting.

Step 3: Install Windows Server 2025

3.1 Language Settings

  1. On the Windows Setup welcome screen, verify:
    • Language to install: English
    • Time and currency format: (your region)
    • Keyboard or input method: US (or your preferred layout)
  2. Click “Next”, then click “Install now”.
  3. Check “I agree to everything will be deleted, including files, apps, and settings” and click “Next”.

3.2 Product Key and Edition Selection (Important)

  1. If prompted for a product key:
    • Have a key? Enter it and click Next.
    • No key? Click “I don’t have a product key” — you can activate later. (Evaluation ISOs typically skip this step.)
  2. Select the edition to install:
    • Windows Server 2025 Standard (Desktop Experience) —  Recommended for most small-business and standalone server scenarios.
    • Windows Server 2025 Datacenter (Desktop Experience) — For large-scale virtualization and hyper-converged infrastructure.

Critical: You must choose the edition with “(Desktop Experience)” in its name. Editions without this suffix are Server Core variants with a command-line-only interface — not suitable for beginners.

3.3 Accept License Terms

Read and accept the Microsoft Software License Terms, then click “Next”.

3.4 Disk Partitioning (Critical Step)

  1. The installer will display existing drives and partitions. If the disk contains an old OS or partitions you no longer need:
    • Select each partition and click “Delete” until the disk shows as “Drive 0 Unallocated Space.”
      ⚠️ Warning: Deleting partitions permanently erases all data on the drive. Double-check that you have selected the correct disk — especially if the machine has multiple drives.
  2. Select “Drive 0 Unallocated Space” and click “New”. Keep the default size (uses the entire disk) and click “Apply”. Confirm any prompts.

3. Windows will automatically create recovery and system (MSR) partitions. Select the newly created primary partition and click “Next”.

Note: If the disk is not visible or you see “We couldn’t install to this disk,” the storage controller driver may be missing. See FAQ Q3 for solutions.

3.5 Wait for Installation to Complete

  1. The screen displays “Installing Windows” as it copies files, installs features, and applies updates. This takes approximately 10–30 minutes. The computer will restart several times automatically — do not turn off the power.
  2. After file installation completes, the machine restarts into the OOBE (Out-of-Box Experience) setup:
    a. Product key: Enter your key, or click “Do this later” to skip.

    b. Administrator password: Create a strong password:

    RequirementDetails
    LengthMinimum 7 characters
    ComplexityMust include at least 3 of 4 categories: uppercase (A–Z), lowercase (a–z), digits (0–9), special characters (!@#$%^&*, etc.)
    Cannot be blankPassword is required during installation
    💡 Security tip: Record your Administrator password in a safe place. Recovering a lost password requires the installation media.

3.6 First Login

  1. When prompted, press Ctrl + Alt + Delete simultaneously.
  2. Enter the Administrator password you set during OOBE.
  3. You will arrive at the Windows Server 2025 desktop.

Step 4: Install Device Drivers

Proper drivers are essential for your HYSTOU mini PC to operate correctly.

4.1 Check Device Manager for Missing Drivers

  1. Right-click the Start button → select Device Manager. (Or type “Device Manager” in the search bar.)
  2. Look for devices with a yellow exclamation mark (⚠️) or entries under “Other devices” labeled “Unknown device.” After a fresh Windows Server install, the following drivers are commonly missing:
    • Network adapter (Ethernet / Wi-Fi)
    • Graphics adapter (GPU / Display)
    • Chipset / SATA / NVMe controller
    • Audio device

4.2 Install Drivers for Your HYSTOU Mini PC

  1. Obtain drivers from HYSTOU:
    • Contact HYSTOU customer support and request the driver package for your specific mini PC model. HYSTOU provides dedicated driver packages or download links for every product.
  2. Install the drivers:
    • Method A (Recommended): Double-click the driver installer (.exe) provided by HYSTOU support and follow the on-screen prompts.
    • Method B (Manual): If drivers are provided as extracted files, right-click the device with the exclamation mark → Update driver → Browse my computer for drivers → navigate to the driver folder → click Next and wait for installation.
  3. Repeat until no devices with exclamation marks remain in Device Manager.

Priority tip: Install the network adapter driver first. Without network connectivity, you cannot download additional drivers or system updates. If you still cannot access the internet after installing all drivers, verify that the network driver was installed correctly.

Step 5: Activate Windows Server 2025

Method A: GUI Activation

  1. Open Settings (gear icon in Start menu) → System → Activation.
  2. Click “Change product key” and enter your genuine product key. Click “Next” to complete activation.

Method B: Command-Line Activation (More Reliable)

  1. Right-click the Start button → select Terminal (Admin) or Windows PowerShell (Admin).
  2. Run the following commands one at a time:
    slmgr /ipk YOUR-PRODUCT-KEY-HERE
    slmgr /ato
  3. Wait for the confirmation message: “Product activated successfully.”
  4. Restart the server to finalize activation.
Important: Always obtain your product key through legitimate channels — Microsoft or HYSTOU customer support. Keep a secure record of your key for future reference.

Troubleshooting & FAQ

Pressing F11 does nothing — I can't access the Boot Menu
  • Start tapping the key immediately when powering on — ideally before the manufacturer logo appears.
  • Different models use different hotkeys: try F7, F11, F12, Esc, or Del.
  • Some motherboards require you to enable the “Boot Menu hotkey” option in BIOS settings first.
  • As a fallback, enter BIOS setup and set the USB drive as the first boot device, then save and exit (usually F10).

Yes. A clean installation of Windows 7 deletes all partitions and data on the target drive. Always back up important files before starting the installation.

  • Confirm the boot USB uses UEFI/GPT mode (Rufus default).
  • If the system uses Intel VMD/RAID or the NVMe drive is not recognized, click “Load Driver” during the disk selection step and load the storage controller driver provided by HYSTOU support.
  • Some older systems may need CSM/Legacy mode enabled in BIOS.

You selected the Server Core edition (without Desktop Experience). Please reinstall and in Step 3.2, choose the edition that includes “(Desktop Experience)” in its name.

Common errors include 0xC004F074 and 0xC004C003. These usually indicate an invalid key or inability to reach Microsoft’s activation servers:
  • Verify the key was entered correctly and matches the installed edition (Standard keys cannot activate Datacenter).
  • Confirm the server has internet access to reach Microsoft activation servers.
  • If activation still fails, contact HYSTOU customer support for assistance.

This means the system is still trying to boot from the USB. When the prompt appears, do not press any key, or remove the USB drive and restart — the system will then boot from the internal drive.

Contact your system or device provider for support. Recovery typically requires the installation media to reset the password. Always record your Administrator password securely after initial setup.

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Author: Nick FU

Marketing Specialist | HYSTOU Mini PC & Network Appliance Manufacturer

HYSTOU has established its R&D headquarters in Shenzhen, drawing on over a decade of experience. Our core team members, who previously served at renowned companies such as Inventec and Quanta Computer, form the backbone of our technical expertise. With robust R&D and innovation capabilities, we remain steadfast in our commitment to pursuing excellence in the field of technology products.

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