Problems with nVidia Graphics drivers & Black Screen

[loki]

Well at least I think it is.

I had a problem over the weekend with my pc saying ntloader missing, so after much fiddling about, I decided to put in an old hdd that I know is working, windows installs fine no problem. I install the latest nVidia drivers and once it gets past the windows boot screen I get a black screen. So after much restarting in safe mode uninstalling drivers and reinstalling every revision of Vista 64 drivers I still get black screened. Now all of these parts have run under Vista 64 without a problem.

My set up is as follows

Mobo: MSI 975 X Platinum
RAM: 4x 1gb Crucial Ballistix
Graphics: BFG 8800GTS OC
OS: Vista Ultimate 64 Bit

As I say I have had all this up and running before with drivers installing no problem. When I look at the device manager It says driver may not have installed properly. The only error message I get is when I try GeForce ForceWare 175.19 Vista (64-bit) drivers and I get a blue screen for all of 2 seconds which says drivers didn't install properly.

I am wondering is this an issue with the Graphics Card or Mobo ?

Any help appreciated