Windows 7: BSOD while playing basicly anything even in full screen youtube

The problem started like a week ago with a BSOD while i was playing LoL i reinstaled my OS and the blue screen appeared ones more while i was instaling graph drivers.
Tried many of the stress tests but they didnt show me anything meaningfull,atleast not for me.
Thanks in advance

Did the crashes start about the same time you installed/updated an application like Skype for example?

Any trouble with crashing prior to the 8/8/12 ?

Nope,i didnt have any problems. At first i thought that it was temperature issue so started some tests but everything was normal( CPU 30°C,GPU 50°C all under moderate stress),after that i cleaned the entire case but that didnt help either.
Then i instaled the OS and the first thing after the isntalation I downloaded the graphics driver and when the instalation started it crashed, i tried that a few times and every time the same crash at the same stage of instalation. After that i tried to install the drivers on the the 2nd partition and it worked. Basically i can use my pc for everything except gaming tho im talking about games that dont require some insane machine (LoL, WoT,SWToR...)

Did you install the chipset drivers before attempting to install the graphics driver?

After a fresh install, the first thing should be installed should be the chipset drivers. It can avoid issues like the one you are describing.

I will try that then get back to you