Windows 11 updates can occasionally fail to install and show an ‘undoing changes to your PC’ error.If you're stuck in a boot loop caused by this error, boot into Safe mode, which will allow you to implement other methods.The first recommended approach is restarting your PC several times until you see the Automatic Repair screen and click on the Advanced Options.Choose to enable Safe Mode, and then uninstall the latest updates that might be causing the issue.Run the Windows Update troubleshooter after booting into Safe mode.Rename the SoftwareDistribution folder to fix the Undoing changes made to your computer error.Fix the corrupted system files by entering several commands on Command Prompt as an Administrator.Uninstall recently installed updates to prevent Windows 11 from attempting to install the update again.Use System Restore, a feature of Windows 11, to undo major system changes.If any of these troubleshooting methods fail to fix the issue, you may ask for help on the Microsoft Forum or seek other technical support.