Memory Damps Blue screen of Death

I play KOS and RAGNAROK Online last night.
When I’m in the meddle of Playing online games.
My computer display BLUE SCREEN.
I restart my computer. Then my computer back to normal
On the next day I play again, then its appears a BLUE SCREEN again
So I restart it.
The blue screen appears over and over until now
What would I do????
Please give me some advise what should I do
Thanks
Blackjan
