ok, this is what cgminer says
HFS 0: Failed to reset after write failure, disabling
HFS 0 failure, disabling!
HFS 0: Failed to get data associated with header
USB init, open device failed, err -12, you need to install a WinUSB driver for - HFA device 2:2-i1
See README.txt file included for help
hashfast detect (2:2) failed to initialise (incorrect device?)

has anyone come across this before?