Apologies for noobish question.
I have been using cgminer to run my 6 usb block eruptors for a few weeks now with all being great. Now that I have finally received my BFL little(which also performs perfectly well, running with bfgminer for now) my cgminer keeps reporting:
USB init, open device failed, err -12, you need to install a Windows USB driver for - BFL device 5:1
You need to run Zadig and install WinUSB for that device.