1] Download Windows 11 ISO and save it to the desktop. Or, you can create the USB setup disk. Don't run setup yet.
2] Perform the steps mentioned in the thread below:
- https://answers.microsoft.com/en-us/windows/forum/all/trying-to-re-register-microsoft-store-along-with/074e102c-16f3-4fd0-96b0-ee92442e2fab
- https://www.winhelponline.com/blog/get-appxpackage-database-disk-image-malformed/
Important: At this point, the Start menu and Settings will be inoperable. A repair installation or in-place upgrade is required after resetting the repository.
3] After completing step #2, mount the Windows 11 ISO and do an in-place upgrade to 25H2.
Resolved threads
- https://answers.microsoft.com/en-us/windows/forum/windows_10-performance/is-this-a-windows-10-issue-or-do-i-have-a-virus/da02813c-9359-4cc3-bbb1-b7ae03b5f22d?messageId=28570be5-91ea-4c9e-962b-ab127466babd
- https://answers.microsoft.com/en-us/windows/forum/windows_10-performance/is-it-possible-to-repair-the-app-repository-using/c8013168-f606-43dc-9a49-2798c9cdc698?messageId=a772efc7-9044-4c40-8843-3e3a77ff95bd