XP on iMac: mouse & keyboard stopped working (USB))

I installed windows XP but after installing the drivers my sound didn't work, so I reinstalled all the drivers from the Leopard CD and after a reboot my mouse and keyboard (both USB connected) stopped responding.

Using an Apple USB keyboard and a logitech USB mouse.

Now I'm guessing something messed up the USB drivers and I can access Windows\system32\drivers.
I just don't know how to get the right drivers in there because I can't do anything in Windows and I can't find the files exploring the disc in OSX.

My specs:
Model Name: iMac
Model Identifier: iMac11,1
Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number Of Processors: 1
Total Number Of Cores: 4

USB High-Speed Bus:

Host Controller Location: Built-in USB
Host Controller Driver: AppleUSBEHCI
PCI Device ID: 0x3b34
PCI Revision ID: 0x0006
PCI Vendor ID: 0x8086
Bus Number: 0xfd

 

OK I fixed it by performing a Windows repair booting from the Windows CD, sound still wasnt working though, fixed that by doing:

Control Panel -> Sound stuff -> 'Audio' tab -> Sound playback: changing default device from "ATI HD Audio rear output" to Cirrus Logic HD Audio" in dropdown menu.

Hope this helps anyone, sure didn't help me...

EDIT: still sounds like ****, it's like I'm listening to a 50's transistor radio in a tin can.