BSOD STOP: ntoskrnl.exe+74ec0: error 0x0000007F

I have a Lenovo Z570 (i5-2450m + 6GB ram + NVidia gt520m) + Windows 7 Ultimate I get BSOD when I try to watch a youtube video in Firefox. I have to say that this laptop has a physical switch to turn on and of Nvidia. Otherwise it uses Intel HD Grapics. During the BSOD Nvidia was disabled. I tried to install the original driver for HD Grapics but I still got BSOD.



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