Right, my computer keeps turning itself off. It gets half way to getting into windows then reboots. Or it gets all the way in, allows me to do some work for 5 minutes then reboots again. Or it lets me watch 25 minutes of Episode 3 of the Armando Iannucci shows and then cuts out as he's giving his comedy speach at the conference he's gone too.

Any reason for this. Or is it just the slow death of a three year old computer? If anyones had a similar problem, some advice would be helpful cause whatever happens I'll need to get some stuff off the damned thing.