Table of Contents
1. Disconnect External Devices
2. Boot into Safe Mode and Resume Installation
3. Use Command Prompt to Repair System Files
4. Clear TPM and Reset BIOS Settings
5. Perform a Clean Installation Using USB Drive
Home Computer Tutorials Troubleshooting Windows could not complete the installation [FIXED]

Windows could not complete the installation [FIXED]

Aug 25, 2025 am 03:34 AM
Install windows

If Windows installation fails or gets stuck, try these steps: 1. Disconnect external devices. 2. Boot into Safe Mode. 3. Repair system files via Command Prompt using sfc and DISM. 4. Clear TPM and reset BIOS. 5. Perform a clean install using a bootable USB.

Windows could not complete the installation [FIXED]

If you encounter the error "Windows could not complete the installation," your system may be stuck during setup. Here are several methods to resolve this issue:

The operating environment of this tutorial: Dell XPS 13, Windows 11

1. Disconnect External Devices

External peripherals can interfere with the Windows installation process, especially during the initial setup phase. Removing them helps isolate potential conflicts.

  • Shut down your computer completely.
  • Disconnect all external devices including USB drives, printers, webcams, and docking stations.
  • Keep only the keyboard, mouse, and monitor connected if necessary.
  • Restart the computer and allow the installation to proceed.
Windows could not complete the installation [FIXED]

2. Boot into Safe Mode and Resume Installation

Safe Mode loads Windows with minimal drivers and services, which can help bypass installation blockers caused by corrupted system processes.

  • Power off the device by holding the power button for 10 seconds.
  • Turn it on and immediately press F8 or Shift F8 repeatedly before the Windows logo appears.
  • If the boot menu appears, select "Safe Mode with Networking" or "Last Known Good Configuration."
  • Allow the system to boot and check if the installation resumes automatically.
Windows could not complete the installation [FIXED]

3. Use Command Prompt to Repair System Files

Corrupted system files might prevent installation completion. Using built-in repair tools via Command Prompt can fix file integrity issues.

  • Boot from a Windows installation USB or DVD.
  • Select your language preferences and click "Next," then choose "Repair your computer."
  • Navigate to "Troubleshoot > Advanced Options > Command Prompt."
  • Run the following commands one at a time:

sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows

DISM /Image:C:\ /Cleanup-Image /RestoreHealth

  • Close the Command Prompt and restart the system after the scan completes.
Windows could not complete the installation [FIXED]

4. Clear TPM and Reset BIOS Settings

A full or improperly configured Trusted Platform Module (TPM) can halt Windows setup, especially on newer devices with security requirements.

  • Restart the computer and enter the BIOS/UEFI setup by pressing F2, F10, or Delete during startup.
  • Navigate to the Security tab and locate the TPM or PTT (Intel Platform Trust Technology) settings.
  • Select "Clear TPM" or "Reset to Factory Defaults" if available.
  • Save changes and exit. The system will reboot and may resume installation.

5. Perform a Clean Installation Using USB Drive

If the installation repeatedly fails, creating a fresh installation medium can eliminate media-related corruption.

  • Download the official Windows Media Creation Tool from Microsoft’s website.
  • Connect a blank USB drive with at least 8GB of storage.
  • Use the tool to create a bootable Windows installer.
  • Boot from the USB drive by changing the boot order in BIOS.
  • During setup, choose "Custom: Install Windows" and delete all existing partitions.
  • Proceed with a clean install on the unallocated space.

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