Just an update for anyone who helped me
Tested the RAM with memtest, one stick produced 3432 errors within 5 seconds of starting. Removing that stick has got rid of the problem
Wierd how it just died, I was playing a game before I installed SP1 so it must have literally died within the 5 minutes of quitting the game
Glad to see you got it sorted mate, just a pity its a 2gb Dimm down the drain!
It does seem to go that way one second its working the next its FUBAR. But hey thats hardware for you.