Scan your pc with an anti virus program and then run Adaware and Spybot as mentioned above. Note that some of the people that give out the spyware actually have ads on websites saying you might have spyware, click here. They are usually made to look like a warning from your pc. Then they give you some spyware when you click on their ad. The spyware/adware problem is now more prevelant than viruses.