Worked until I installed TV tuner driver (brand new product from Pinnacle)
and then it rebooted 6 times. Removed hardware and tried safe mode and used a
previous restore point - after subsequent reboot it got to the black screen
and no further... Tried booting from DVD and then tried all 15 restore points
all of which failed. Tried the Diagnostic Start option from DVD and it said
there was no problem. So now I am stuck, can't restore, can't boot and Vista
diagnostics say no problem

Any ideas? Any other tools or tricks ?