So yesterday my computer was infected by a virus (win 7 Internet protection 2012 I believe) but with the help of a friend of mine who told me to 'trick it' into believing I purchased it and gave me a code I took care of that. I'm just mentioning this in case it might be of some relevance to my current situation. Well, my computer is a laptop (dell inspiron 17r) with McAfee security and I make sure to do a full scan whenever I turn it on. Today, I tried opening the snipping tool but the 'open with' window opened up instead. I tried opening paint instead, but the same thing reoccurred. I chose to browse and tried opening paint with paint, but an error warning would pop up saying "C:\WINDOWS\SYSTEM32\MSPAINT.EXE PAINT cannot read this file. This is not a valid bitmap file, or its format is not currently supported." Same thing applies to any other program or file I try to open, I suspect a virus is at work but the McAfee scan doesn't find anything. Please help?