I don't know if this is still relevant
but I saw dmex give this to someone
a while back. -> HERE
Here’s how to get it done:
1. Open an elevated command prompt
2. type “bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS” without the quotes (and no the DD is not a typo).
3. Reboot and enjoy being able to use unsigned drivers in Vista x64.
4. Remember who told you about this first.