Suggestions:
Go to Start > Help and Support> and click System Restore. Follow the wizard to set your system back to an earlier date before the program was installed.
Download and install Adaware
http://www.lavasoft.de/software/adaware/
Download and install Spybot
http://security.kolla.de/news.php?lang=en
both of those will help clean your system.
Start > Control Panel > Administrative Tools > Event Viewer > Application Log and see if any strange programs were started.
Also you might try looking in Start > Control Panel > Add remove Programs and see if there are any wierd programs on the list.