I am running Windows Xp Professional with the latest updates (checked today). I am also having having Avast Free Antivirus, Lavasoft Adware Free, and Spyware Doctor. All updated.
I have 2 x 80 GB Segate SATA HDDs with atleast 100 GB free in both drives.
And AMD Athlon 64 bit 3500+, 1 GB...