Anyway, continuing on from the previous one.
This one has something to do with unremovable malware. So like, it also said that restarting the computer doesn't remove it so I googled startup tasks and where in a registry this would be.
The registry is SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\
. And if you go into SpecialAccounts\Shell
you find the malware file that starts up.