Screen goes black when streaming any kind of video.

Hi,

I have this problem where my screen goes black when ever i watch a clip on youtube or on the internet. Sometimes the screen comes back all green and it gives the 'display driver nvlddmkm stopped responding and has successfully recovered' alert.. 

Whenever this happens I can no longer use my computer i have to shut it down (holding down the power button for 10 seconds)

This problem has a very bad timing as my warranty ran out 2 days ago.

Some help would really be appreciated.

Thanks

Arno Doublet