|Do you have an antivirus program installed?|
Do you have anti spyware software installed?
If yes, have you run them lately?
If no, then it's time you got some.
This sounds to me like a computer that's so stuffed up with spyware it can't run properly. I highly recommend Spybot S&D. There are others like AdAware that also work good. Chances are, you may need to install two or more programs to clean all the junk out of your PC.
I'm sure other people will respond with other ideas and recommendations so keep watching this string.