ive managed to sort the screen out, now when vista boots it justs shows a blue screen of death everytime showing an IRQL_not_less_than_equal crap.
trying safe mode but says windows cannot complete the installation in safe mode, and restarts.
Try Safe Mode with Networking instead of regular safe mode. This allowed setup to complete during the betas when I had similar driver issues.
Also, are you running SLI (meaning is the hardware jumper or BIOS option setup for SLI) and/or have multiple monitors connected?
If you can complete setup in safe mode w/ networking, Go back to safe mode after setup and try installing the latest Vista drivers from NVIDIA's website or the latest leaked ones from http://www.laptopvideo2go.com/
Another official NVIDIA release is supposed to be available tommorw.
As a last resort, if you can get to a command prompt, run pnputil -?
That will give you instructions on how to use pnputil. With it you can enumerate, install or delete driver packages, such as one of NVIDIAs drivers.