from M-audio...
M-Audio does not support Boot Camp on Intel based Macs at this time.
The problem is that there is no BIOS on Mac Intel systems and getting devices to work on some XP systems requires BIOS/OS tweaks. Boot Camp works around the need for BIOS; Windows does not. Windows installations are not always consistent and the fact it works on one Intel Mac does not mean it will work on another.
Attempting to install any M-Audio device or drivers in Boot Camp is done solely at the user’s own risk.
Here is a website that has many troubleshooting tips that can help get devices to work on XP and MAY work for Boot Camp; however this is all done at the users own risk.
http://www.pcaudiolabs.com/setuptips1.asp?cat=setu
For M-Audio FireWire devices:
Switching from Mac to PC the FireWire device may not always load the firmware properly. To get the PC firmware to load you may have to boot into XP then shut down, disconnect, reconnect and reboot. Switching from PC to Mac automatically loads the correct firmware.
If this workaround does not fix your issue, you will have to run the device solely on Mac OS or on Windows hardware.