1) How many pc's on your LAN?
Well 2, counting this one, that are physically connected. My PS2 is also connected, and there is a computer on a wireless connection downstairs.
2) What operating systems do the other pc's use?
All XP, except this one which is XP 64 bit
3) Can all pc's including your x64 access the internet?
Yup
4) What brand and model of switch/hub/router?
Well, I am using fiber optic connection, so tthey gave me a D-Link router, but I also have a Linksys that is connected to other stuff, but I don't think this is really an issue since I tried connecting directly without any hub/router at all and it still didn't show up.
Also, this computer doesn't have any password. The other one does, but the password is nothing.