I don’t know about you but I sure have been hit with spam more than normal recently.  Here is a list of free tools that I regularly use to keep my machine clean.

            Stinger virus (http://vil.nai.com/vil/stinger/)

            Shoot the messenger (http://grc.com/stm/ShootTheMessenger.htm)

            Ad Aware (http://www.lavasoftusa.com/software/adaware/)

            AVG Virus (http://www.grisoft.com/us/us_index.php)

            MSConfig (http://netsquirrel.com/msconfig/)

            Zonealarm (http://www.zonelabs.com/store/content/company/zap_za_grid.jsp)