You may want to download and install this free program called SpywareBlaster from CNET.com

http://download.cnet.com/1770-20_4-0.html?query=spywareblaster&platformSelect=Windows&tag=srch%3Ba&searchtype=downloads&filterName=platform%3DWindows&filter=platform%3DWindows

Publisher's Description
From BrightFort:

SpywareBlaster doesn't scan for and clean spyware--it prevents it from being installed in the first place. SpywareBlaster prevents the installation of ActiveX-based spyware, adware, dialers, browser hijackers, and other potentially unwanted programs. It can also block spyware/tracking cookies in IE, Mozilla Firefox, Netscape, and many other browsers, and restrict the actions of spyware/ad/tracking sites. With the built-in Check for Updates feature, you can help ensure your protection is up-to-date. SpywareBlaster also includes a System Snapshot feature, which lets you take a snapshot of your computer in its clean state and later revert, undoing many changes made by spyware and browser hijackers.

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Its a small but powerful program that I installed about a week ago. This computer has never ran better since installing it. Your mileage may vary. Good luck.

Don