Win7 x64 won't recognize my raid drivers as signed

Hi all, I've been running the RC for around 3 months now and love it. I didn't have any issues when I installed it. I added the drivers for my raid card when the select partition option came up, it installed them and away it went. Now that I'm trying to install the retail version it insists that my drivers are unsigned and that's the end of that. I've tried using the repair system work around to get the drivers loaded; but that option says that the drivers don't match my installed hardware. I'm using the exact same driver I used for the RC, on the same thumb drive in fact. Plus, Promise says they're signed. I know there isn't a problem with the raid card because I'm on the system now. Anybody have any ideas?
Thanks.

Well, I got it about an hour after my post so I figured I'd report back in case anyone else has a Promise FastTrak 2650 and runs into the same issue. Even though I hadn't done it while installing the RC, I unplugged everything except for my keyboard and mouse. I switched over to a VGA cable as well. This time instead of pointing the install to the 64 bit drivers I just hit ok and let it look for its self. It loaded the 32 bit drivers, proceeded with the install and then somehow reconfigured its self with the proper drivers once Windows was up and running. As soon as I hit windows update it downloaded the very same x64 driver I was trying to install from my thumb drive and installed it just fine. So now its up and running perfectly. I thought letting it load a 32 bit driver would have hosed the install; but apparently I was wrong.