Registry issues - is it replacable?

Hello!

I have installed a full version of Registry Clean Expert to speed up my computer a little, and to get rid of junk in the registry.

Firstly I made a backup of the entire registry using the program mentioned. I run the cleanup process, it finds more than 400 "Problems" which I gladly "Repair" when it's done scanning the registry. When I've hit the Repair button i shut down the program and everything suddenly disappears. A blank black screen is all I get - and the cursor, which I can still move. I try ctr+alt+del etc, but nothing happens. I reboot the computer only to be met by the exact same thing when Windows has finished loading, instead of a login page, or a desktop that would usually appear I get a blank black screen with just the cursor, which I still can move. Ctrl+alt+del still doesn't work, nothing happens. I try the different safe modes but I get the exact same thing..

After a lot of hassle I manage to boot the computer with my Windows CD, I try the windows repair tool - but nothing changes. I try launching windows with "the latest working configuration", but same thing there..

So the only way I can think of that might solve my problem (except of course formating the HD and completely reinstalling Vista) is to remove the hard drive with the broken vista, drive to a friends house, insert the drive in his computer and then in some way manually replace the windows registry on my hard drive with the backup (which is on the same drive) I made before running Registry Clean Expert.

Would this possibly work? If so, how would I do this? Where is the registry files(if there even are any  ) located on the drive?

Your help would be greatly appreciated as I am disabled in every way without my computer!
/Freddy

btw.
The OS is Windows Vista Ultimate x64
I can translate this into Swedish if there are any Swedish techies reading this but not understanding it..