How to Fix Windows 11 Installation Error 0xC1900101 - 0x40021

Solving Windows 11 Installation Error 0xC1900101 - 0x40021

The dreaded 0xC1900101 - 0x40021 error can derail your Windows 11 upgrade. This guide offers several solutions to get you up and running.

This error manifests in various forms, including:

• 0xC1900101 – 0x2000c
• 0xC1900101 – 0x20004
• 0xC1900101 – 0x20017
• 0xC1900101 – 0x40017
• 0xC1900101 – 0x30018
• 0xC1900101 – 0x40021

Let's tackle the 0xC1900101 - 0x40021 variant.

Method 1: Disk Cleanup

A cluttered hard drive can trigger this error. Free up space to improve performance:

1. Search for "disk cleanup" and select the Disk Cleanup utility.
2. Select your system drive (usually C:) and click "OK".
3. Review the files to delete and click "OK".
4. Confirm by clicking "Delete Files".

Method 2: Update Graphics Drivers

Outdated graphics drivers are a common culprit. Update them:

1. Press Windows R, type devmgmt.msc, and press Enter to open Device Manager.
2. Expand "Display adapters", right-click your graphics card, and select "Update driver".
3. Choose "Search automatically for drivers" and follow the on-screen instructions.

Method 3: Run Windows Update Troubleshooter

Windows' built-in troubleshooter can often resolve update issues:

1. Open Settings (Windows I).
2. Navigate to System > Troubleshoot > Other troubleshooters.
3. Run the Windows Update troubleshooter.

Method 4: System File Checker (SFC)

Corrupted system files can cause installation problems. SFC can repair them:

1. Search for "cmd", right-click "Command Prompt", and select "Run as administrator".
2. Type sfc /scannow and press Enter. This process takes time; be patient.

Method 5: Repair Install Using ISO

If all else fails, a clean install using the Windows 11 ISO image might be necessary:

1. Download the Windows 11 ISO from the official Microsoft website.
2. Mount the ISO and run the setup file.
3. Follow the on-screen instructions, choosing to keep your files.
4. After installation, download and install any pending updates.

Conclusion

These methods provide a comprehensive approach to resolving the Windows 11 installation error 0xC1900101 - 0x40021. Try these solutions sequentially, and hopefully, you'll successfully upgrade to Windows 11.

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