i have a gf 6800 xtreme 256MB pci-e video card

i am tring to play World of war craft, bu tas soon as i get in i play for about 1 miniute then my computer restarts

i have no idea what is going on

This is usually inadequate power from the power supply, overheating, or bad/misconfigured memory.

Start ruling them out one by one. I'd start with it may be overheating. Take the side off your computer and try again. This is a poor man's way of increasing airflow. Does it still restart? If so, does it last longer than a minute?

"Milk was a bad choice!"

I would doubt its a heat issue, but I've been wrong before. I had the same problem with my old motherboard and the CPU still hits about 67C under load, but runs flawlessly. Ran memtest overnight on the ram and showed fine. Bought an antec power supply and no problems since. run memtest overnight and if there's no errors then replace the power supply.

I suspect it's the power supply as well, but this is the cheapest and easiest thing to try.

"How many squirrels had to die to make you look fly?!"

Nvidia 6000+ requires at least 350w Powersupply

Nvidia 7000+ requires at least 400w Powersupply

Multiple harddisk drives and lots of USB drives etc will chew up more power so add +50w for this sort of stuff... i was running 7800 on a 350w and same issue... upgraded to 430w and its all good. Also a 550w Powersupply that is cheaper than thermaltake 430 or antec 450 is BullS***. They are dodgey and dont buy em... make sure its thermaltake or antec...fullstop end of story

"make sure its thermaltake or antec"

I like those brands, but other good brands are out there such as PC Power and Cooling, Enermax, ePower,Vantec, OCZ to name a few.

"How many squirrels had to die to make you look fly?!"

Ok... sorry i was going for the newbie hardware type of guy here... sure they are good brands 2 but i found it is easier to find an antec or thermatake.

Also when u give 8 different brands, they are likely to forget and go "hmmm...Kingmax 500w... I think that was on the list..." when that is the dodgey brand where i used to work sold... for like word processing machines.

i had the same problem. i tried replacing psu with 450w, still no good. i had a nvidia geforce 6200. i tried numerous things, and my soulution was just upgrade to the latest Nvidia forceware. i have NO idea why that worked, but it did. give that a try, its free and easy to do.
Nvidia.com