Quote Originally Posted by Roto13 View Post
Is your hard drive any emptier than it was yesterday? Half of your programs disappearing would probably make a noticeable difference.
Aye. It might not be a malicious program, it could be a sign of your hard drive failing.

First of all, though, I'd back up your documents, music, pictures, ect. onto a separate drive or computer. Just as a precaution.

Then, run CHKDSK on your own computer.