https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4532693-update-bug-reportedly-deletes-user-files/

The Windows 10 KB4532693 update appears to be buggier than originally thought as users are reporting that the update is deleting their files.

After the Windows 10 KB4532693 cumulative update was released last week, users started to report that their desktop and Start Menu was reset to the default settings and that they could no longer find files stored in their user profile.