Have you run your anti-virus and spyware programs? If so what have you run and what were the results?
If you have no anti-spyware programs, download, update and run Spybot S&D click here Spyware Terminator click here and a-squared free click here.
If you want to post a HJT log, the auto checker is click here and the best site for analysis is click here. Make sure you go to the English part of the site.