Firewall…Comodo firewall (:CLP)…can’t wait for V3…Hips vista compatible
Antivirus …Antivir, bitdefender free
Antispyware…Spycatcher express, adware se personal edition, spywareblaster
PAID VERSIONS
firewall…zonealarm firewall Pro
Antivirus… Antivir[/b], Nod 32…fast scan
Antispyware…Spyware doctor, webroot spy sweeper
Security suite…Zonealarm internet security, Norton internet security
Comodo Firewall Pro (CFP - does this need to be repeated a million times? ;D)
SuperAntispyware Free (SAS) Free
HijackThis (classic but still useful; the new version has been bought by TrendMicro)
Spybot: Search & Destroy (useful, but I don’t need it anymore)
CCleaner (to a vague extent is a security program :D)
Opera browser’s built-in site blocker (blocks ads, pop-ups and any site, namely malicious ones)