This is my son's computer so I'm not exactly sure when the system was corrupted. I noticed when I first used it after mine had a video card failure. Noticed the browser was taken over when I opened it so did virus updates and scans which found problems. When Symantec rebooted the system it was stuck on black screen with mouse cursor. Got into system through control panel, killing explorer task and restarting it manually, then deleted some programs. I think the virus is gone now but...
Taplika Infection with Black Screen
Taplika Infection with Black Screen