Need help with Windows XP x64

I built a new rig yesterday. It is as follows:

Core i7
Asus P6T Deluxe V2 Mobo
6 GB XMS3 Corsair Memory
BFG Tech GTX 275
1 TB Seagate HDD

I am attemping to use my old mouse and keyboard combo which is a Logitech LX700. I've had really good luck with this combo for the last 4 years and don't want to get rid of it. Everything was working fine, but as soon as I went to install the drivers with Asus InstAll, it installed the intel chipset drivers and rebooted, and when it booted back up my mouse and keyboard wouldn't work. I'm almost 100% certain it has something to do with the 64-bit OS and my mouse/keyboard compatability. I can see switching to a 64-bit OS will be an absolute nightmare. I have a PS2 mouse and keyboard and tried plugging them in and they wouldn't work either, so I couldn't even type in my password to get into Windows.

On a slightly less important note, does anyone know of a good wireless PCI adapter that is compatible with a 64-bit OS? I bought a Linksys WMP600 from Best Buy, and the guys there said it would work, but I have read that it doesn't for some people. So I'm anticipating some issues there too. Thanks.