Some malware can hide itself in normal mode, so I'd boot to Safe Mode and do a full system scan with both the antivirus and MalwareBytes.
-
You can check for corrupted system files. Open an administrator command prompt and run SFC if the above doesn't help. Click START, then type CMD in the search box, right-click CMD.EXE and click Run as administrator. Then from the command prompt type sfc /scannow.
Hi, I was on my computer and a window started popping up saying "Do you want to install Windows RegEdit", "Red Flag" I clicked "cancel" and it kept popping up. I tried to run Malware bytes, and Hitman Pro while it was happening and it just prevented me from doing either. I just shut down and rebooted. I got that message one more time. I ran Malwarebytes and Hitman and no crap was found. But now I suspect there is something running that prevents me from running task manager. I right click the toolbar for task manager, it pops up and then goes away real quick. There could be something planted in startup or something still there that prevents me from running task manager. I want to see what kind of mysterious task might be running so I can kill it. Something I suspect got through my firewall of Norton and Malewarebytes. Any ideas people. Thanks, Jay.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic