unable to locate m-audio hardware. make sure your hardware is..works fine in ableton?

[pein]

yeah i know its one of these threads again but i didnt find any answers in the other ones, but here's the thing:

when i run ProTools 7.4 it says "unable to locate m-audio hardware. make sure your hardware is connected and turned on" even when my hardware is connected and fully working?!

specs:

FastTrack Pro
Windows Vista 32bit SP1
ProTools CS2
and ive reinstalled,tried to change the usb ports, and i have all the right drivers im 100% sure, and it says device is fully working in device manager and so on!

and i know its not broken cause FastTrack Pro works fine in Ableton and Cubase! :S

hmm i just realised its not connected?

but it still works?? i have my headphones connected and i can hear fine and it works in other programs?? :S

any ideas on how to fix this? :S