I have an averatec 3300 laptop and for some reason it reads some cd's and not others. It didn't really bother me too much until I bought Webroot Spysweeper and tried to load it on and my computer just doesn't even seem to recognize that there is a cd in the drive, and it's really frustrating me because my computer is getting a lot of spyware on it! What's wrong and what do I need to do to fix it?