At this point, it probably wouldn't hurt to run a system defrag. And a "disk clean Up"
START>All programs>Accessories>system tools> disk defrag./disk clean up
And to be sure there are no nasties on the system, download install, update and run a full scan with Malwarebytes......"Spybot Search and Destroy" is a good one too, just DON'T install the "tea timer", if you are going to try Spybot
edit: an uh, thanks for the bail-out, BC