Windows Security at home
http://www.microsoft.com/athome/security/protect/windowsxpsp2/Default.mspx

MS Security Update
http://update.microsoft.com/microsoftupdate/v6/muoptdefault.aspx

MS Protect your PC
http://www.microsoft.com/athome/security/protect/windowsxpsp2/Default.mspx

Symantec
http://www.symantec.com

Spybot – Search and Destroy
http://www.safer-networking.org/en/index.html

Forum – Security and Virus info
http://forums.computers.toshiba-europe.com/jive3/category.jspa?categoryID=57