|GPEdit should have fixed your problem with task manager but otherwise we really can't help you unless you tell us what Virus you have. If you ran malwarebytes it should have told you that. Once we know then we can tell you how to fix it.|
It sounds like you may have a rootkit in which case you need to do the following before you run the Virus scan...
Rootkits are a real buggers to get rid of because they infect your system files and Windows has a security feature that will restore the system files from a recovery section. The problem is the rootkit corrupts those files too so when you use a Virus Scanner to remove them they just come back as a part of the System Restore built into Windows.
The problem with rootkits is there is really no sure fire way of getting rid of them short of reformating.
The other problem with rootkits is that you sometimes have to boot off of a system disk to remove them to prevent from loading the infected explorer.exe.
I hope this helps.