I'm guessing you hit a porn site or joke site and either knowingly or unknowingly downloaded one of their special "Viewers"
You need to look in Windows Explorer, look for proggies added or changed within the time frame this started happening, you will have a long list, go through it and see what has changed from the previous week, long process
or do like i had to do with my friends puter
Wiped it clean and reloaded windows and slapped his wrist for downloading programs he knew nothing about
Get this, He had 52 processes running after windows loaded, and couldn't figure out why his computer was so slow....lol
NwBie