That's funny, because I recieved this computer straight from Dell, and I've got the stupid WGATRAY thing that bugs me all the time. So I deleted it from the startup routine, and deleted it from SYSTEM32... And no more WGATRAY. It still bugs me that I can't recieve "certain updates" and I can't try beta software and I can't try free Windows stuff and...
Anyway, I'm not so sure that my dad told me everything about this computer. I have a feeling that it initially came with XP Home, and he used somebody's copy of Professional.