The best Internet Security Suite (Firewall, Anti-Spyware, Anti-Virus, Anti-Spam, Pop-Up Blocker, Mail Scanner, and Parental Control) I have found is from Kapersky. They have a Free Virus Scanner here. http://www.kaspersky.com/virusscanner They also have a FREE 30day Full Version trial here. http://usa.kaspersky.com/trials/home-users/internet-security-7/
Kapersky has been rated at the top ( #1 or #2 ) by the leading independant review and
certifying boards year after year. These certifying boards are not sponsored by any
AV companies ( like Norton or McAffee or Bit Defender, etc.) Thir testing is actually scientific
and unbiased. I have tested and used many brands and this is the only one I use now.
If you Must use FREEWARE utilities. The best combination I have come up with is.
Comodo firewall, Spyware Terminator, and Avira Antivir
http://www.personalfirewall.comodo.com/download_firewall.html
http://dnl.spywareterminator.com/install/sap_landing_spyware_terminator.aspx?tbid=60287&banner_id=GGL_CT_ppc_60287_01_04_548FREE_*GeoUSCA*_-Search-__spyware%20terminator&gclid=CLam3-G8u5ICFQNEPAodHgNIMw
http://www.free-av.com/