Graphics card or drivers

[Savy]

So I've had my pc on today for about 5-6hours and its been fine, been playing games without a problem and I haven't noticed anything weird. Then I loaded up a game and my graphics card either crashed or the drivers crash, this happens once/twice every 2weeks or so. What I tend to do is just turn my pc off for 10minutes, switch it back on and its fine and it wont happen again. But this time I've got weird lines all over my screen and I've got no idea whats going on, I've rebooted twice, left my pc off for a hour and tried it but its still the same. When I boot my pc up I get weird green boxes on my screen and when my pc is fully booted up I have green lines on my screen. I got no idea if my graphics card is dying or if its just the drivers being faulty. My pc is booting up normally but I'm just getting these weird lines on my screen.


My graphics card is a Nvidia 9800GT and I've had it since 2007, only started to have the weird drivers crashing since June/July this year. Any help would be appreciated.