Now that I've reset the BIOS by removing battery from motherboard AND re-installed Windows XP.
I realize now that I need to re-install drivers.
I found the page to download drivers for my motherboard ASUS P5Q PRO - HERE
So I've downloaded them with my laptop (cuz network driver on desktop not installed yet). I'll copy them over to my desktop and install them. Two questions:
1. Is there any particular order in which these should be installed?
2. Should I install BIOS updates from this page? All the warnings about updating BIOS are kind of intimidating....
Thanks for all the help!