When I had win7 x64, if I allowed unsigned drivers I got this dialog: http://usbdm.sourceforge.net/USBDM_V4.9/USBDM_JMxx/html/UpdateDriverSoftware3.png so the option is somewhere in the Control panel. In win8 there is no option so I can't say where it is, maybe in the action center? or type "unsigned" in the search
