While I can point to the damage OS, I rarely can guess why it happens. The list is too long here and doesn't fix it.

To fix these I have to check with the client if they have backups of what they can't lose then factory reset the PC. If there is no factory reset we do a clean install of Windows 10 then the drivers and apps to bring it current.

As to what causes this, I usually find a trojan or more than one antivirus suite.