I just bought Retro/Grade and my computer doesn't automatically detect my Xbox 360 GH2 X-plorer, instead fails to automatically find a driver for it, leaving me unable to choose the Guitar control option in Retro/Grade.
What do I do?
It's not as complicated as it might seem, all you need to do is to tell your computer to treat it as a traditional Xbox 360 Wired controller.
If you're on Windows 7, all you need to do is to go to
Control Panel\Hardware and Sound\Devices and Printers in the Windows Explorer (WinE then AltD and CtrlV, if you're the lazy type), right click on the Guitar Hero X-plorer icon and instead of automatically finding a driver, choose find a manual driver, and under the "Let me pick from a list of device drivers on my computer" choose the Microsoft controller category, and choose one of the exisiting Xbox 360 Controller drivers.