This could be the worst Windows 10 update yet

Windows 10 has had its fair share of failings recently but none are as damaging as the latest update, which is causing Blue Screen of Death errors and deleting files.

Users who downloaded Windows 10 KB4549951 are reporting a range of problems, from system errors to personal files being deleted without permission, Windows Latest reported. Microsoft released the latest version of Windows 10 on April 14 to patch a number of security problems.
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https://www.laptopmag.com/news/windows-10-update-bug-deletes-your-personal-files-what-to-do-now