Did you try to modify the registry directly?
Open regedit.exe.
Navigate to HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced and change the Hidden registry key from 2 to 1. If you don't know how to do so, better don't mess with it because incorrectly editing the registry may cause your computer to stop functioning!
In any case, you should scan your whole PC with MBAM or something like that, and post the logs.
Regards,
ThexDarksider