Ok, wtf is going on?

[Pavlyk]

Ok just a couple of minutes ago I restarted my pc trying to boot into Xp Pro. Ok it's all well loading and stuff...the indicator bar keeps going and going and then a blank black screen and the pc restarts. It keeps on doing this every time now? Any ideas on what might have caused this?

 

[MadMan2k]

Try tapping the F8 key while it's booting, then select Safe Mode. If you can boot into safe mode fine, try selecting 'Last Known Good configuration'.

 

[Deathwalker]

If you can get windows up and running try using BootVIS to optimise your booting