How to resolve error code 0x800f0926: Insufficient disk space during Windows 11 installation

If you encounter error code 0x800f0926 while attempting to install Windows 11, it indicates that your computer lacks the necessary disk space for the installation. Follow these steps to resolve this issue:

1. Clear up disk space: Remove unnecessary files or applications from your computer to increase available disk space. Utilize the Disk Cleanup tool to eliminate temporary files, system files, and other redundant data.
2. Transfer files to an external storage: If there are essential files you cannot delete, consider moving them to an external hard drive or a cloud storage service to free up space on your computer.
3. Turn off hibernation: Hibernation generates a large file on your hard drive that consumes significant space. Disable hibernation by opening the Command Prompt as an administrator, typing 'powercfg -h off' (without quotes), and pressing Enter.
4. Disable system restore: System restore creates restore points that can occupy a substantial amount of space. To disable system restore, right-click on My Computer, select Properties, click on System Protection, and then click Configure. From there, you can turn off system restore.
5. Use a disk cleanup utility: There are various third-party disk cleanup utilities that can assist in freeing up disk space on your computer. Popular options include CCleaner, Disk Cleanup Pro, and CleanMyPC.

After freeing up sufficient disk space, attempt to install Windows 11 once more.