If it's less than a year old then take it back to where you got it and demand they replace it. No PC should be fucking up like that after 1 year.
I'm also not sure how they can tell its a graphics issue by the blue screen message. From what I understand only a handful of people in the world can decipher that code on the screen. Also from my own experience the vast majority of blue screens are usually caused by faulty or damaged motherboards. Graphics cards don't tend to cause bluescreen.
There should be an option somewhere to update drivers on your PC, alternatively you can go to
http://www.nvidia.co.uk/Download/index.aspx?lang=en-uk and find drivers for your system, but you'll need to know exactly what you have.
But I'll tell you again, I HIGHLY doubt this has anything to do with drivers.