Problems with my computer Please help

Hi Everyone ,
As a new member in forum, I am in little bit hesitation to share my computer problem which is running well Battlefield BC2 and CoD MW2 with smooth display.
But recently its flickering and failed to solve by driver update.
My pc spec is in below:
CPU – Intel Core i7 X4
GPU – AMD Radeon HD 6800
Operating System – Windows 7 64 bit
Thanks
