The Ultimate Boot CD for Windows is probably your best bet.

Before disaster strikes, make a bootable recovery CDROM.

If you use Email, use an Anti-SPAM program and keep it updated.

TrendMicro HijackThis (FREE, good for reporting).

Microsoft Windows Defender (FREE, requires Genuine Advantage).

Malware Removal and Protection Guide (FREE).

Comodo AntiMalware (FREE, no conditions).Use Anti-Spyware software and keep them updated.Panda Cloud Antivirus (FREE for Home Users).Clamwin (FREE, does not have real-time scanner.manual scans only).AVG Anti-Virus FREE Edition (FREE for home use).Avira Antivir (FREE for home use, crippleware).Avast! Home Edition (FREE for home use).Comodo Antivirus (FREE, no restrictions).Use an Anti-Virus software and keep it updated.Windows Firewall (FREE, comes with Windows XP, the SP2 version is recommended if you go this route but does not protect outbound traffic).

Comodo Firewall Pro (FREE no restrictions).Even if you have a hardware firewall, use a software firewall.Use a hardware firewall if you can afford one.I personally use Firefox because I am a web developer and really like the custom extensions available. I am not going into the 'who is more secure' debate because hackers target whoever is 'on top' and that is the IE browser. Use a web browser other than Microsoft Internet Explorer.In order to enjoy your games, your PC needs to be in top condition and that means keeping bad programs away from it.

Download comodo firewall only