To allow unsigned drivers:-
You need to turn on loading of unsigned drivers.
You do it by choosing option in text boot menu (the one that you will get after pushing "F8" key just on start of Windows booting).
Using the F8 option. An F8 Advanced Boot Option introduced with Windows Vista—“Disable Driver Signature Enforcement”—is available to disable the kernel-signing enforcement only for the current boot session. This setting does not persist across boot sessions.