Sadly, many people don't know how to keep their computers clean nor efficient, causing their computer to be riddled with aggravating spyware, malware, viruses, fragmentation, registry defects, etc. etc.
Got any good, free, perhaps Open Source apps out there you use to keep your computer running smooth? To start off, I use Spybot: Search and Destroy to get rid of unwanted Spyware.
Of course, if anything you do results in your system becoming blown up or screwed up, it's not our fault. Back up your system before doing anything rash.