Could be a nasty. Run anti virus program(I'M assuming you have anti virus installed if not google AVG FREE and install and scan your lappy). You could also install SPYBOT SEARCH and DESTROY. Are you running XP or VISTA? You can run this Microsoft program but only with Internet Explorer and not Firefox or other browsers(http://onecare.live.com/site/en-us/default.htm). Hope this helps.
AVG and Spybot are reputable software unlike that "free" thing you downloaded.
Scotboy7
March 2009