shut down the pc reboot
and press F8 (may be different on other PCs) you should see a screen with some options

chose the "disable driver signature enforcement" windows should now start and let you use RJL

try installing it under this mode

if that method doesn't work well try this one

download and install pspdisp

the install of pspdisp will install a signed version of the type B drivers without going through the whole "disable driver signature enforcement" thing

installing pspdisp is easy and shouldn't require a "how to"  (thanks to dsilverb for the idea)