Vista 64 Ultimate - Blue Screen then - Boots to Black Screen

After the recent Vista Updates last week i Noticed my PC was freezing. It

eventually Blue screened on me. When I went to reboot it would only reach a

black screen with the mouse pointer available and functioning.

I have tried to enter via the various Safe Mode options but all lead to the

same black screen. I have tried using the repair functions from my orginal

disc but it suggests there are no errors and I can subsequently only get to

the blank black screen with mousey.

I placed all my HDs in a seperate machine running Vista Home Prem 32 and all

were accessible except for the Hd that contaned my Vista 64. It appears in

Computer as a Local Disk but Access is denied. The only way I can the see

data in any capacity is when I attempt to apply security permissions to the

disc. It applies permissions to all but a few files showing that the data is

still on the disc.

Any ideas ? I have previously repaired XP System Hives using the backup

files and aftermarket command line software is there any other way I can

repair this Vista as I need to clarify what if anything I stand to lose from

this volume before I think of reformatting and reinstalling.

I have also disconnected any new hardware and I sadly have no Restoe Points

to work to.