Booting problems

[manic111]

I am having trouble when booting Windows. It gets partway through the boot process (after the loading bar ends but before the Vista logo comes up) and then resets itself with no blue screen. Any ideas? I have run memtest and it is fine.

 

[manic111]

Seems odd if it is-after rebooting itself a couple of times it boots to Windows and is perfectly stable when it reaches it. I have no corrupted data or anything either.