XP
running windows defender
windows firewall
AVAST anti-virus, did a complete system scan with that yesterday
How do you start that Windows Malicious Software tool thingy??
http://www.xp-vista.com/spyware-removal/fedex-tracking-number-email-virus-removal-instructions
...OF COURSE getting some of the free anti-virus info your getting here maybe easier...but give it a try