Even though I have not used M$ for almost a year, I do recall the AV program I did use. I would recommend it to anyone.

AVG Free Edition Anti-Virus

[shadow]They have received the VB100% in the test of Virus Bulletin in June 2004 on Windows XP platform.[/shadow]
Also...
[shadow]100% detection rate of AVG Anti-Virus System is continuously certified by independent ICSA laboratories.[/shadow]

You use what you want, but use something! and keep it up to date!

Have a good day.