BSOD ntoskrnl.exe+71f00

It is because of the display driver apparently, but the display settings (nvidia optimus ... I feel that you like optimus prime, me too; but the namesake technology is sometimes problematic).

First let us alter the display driver and see what happens. Install the NVIDIA DRIVERS 314.22WHQL only.

• Uninstall All nvidia items in Control Panel > Programs and features
  
  • 3D Vision Control Driver
  • 3D Vision Driver
  • Graphics Driver
  • HD Audio Driver
  • PhysX
  • nvidia Update
  
  (Are you using nvidia chipset drivers? If so, dont uninstall anything other than those are listed).
• Now follow Drivers - Clean Left over Files after Uninstalling
• Download 314.22 WHQL. While installing, Select Custom (Advanced) install. In the next page, follow this settings:
  
  

Let us know the results.

piedro7 said:

I have done your procedure and first it looked like it worked, but today BSOD appeared again...

Post it following the Blue Screen of Death (BSOD) Posting Instructions.

It is a BSOD with the nvidia 314.22 WHQL driver.

At this point we can say that the issue is with the nvidia optimous settings. This settings cause such driver power state failures, but it is said to be needed to preserve the battery.

I really dont know a way to make the situation better without changing the settings to the "dedicated GPU only" setup.

At the same time I am noticing that you dont have Service pack 1 installed.

To alter everything in a single go, follow Clean Reinstall - Factory OEM Windows 7, step by step. It will give you something more than a clean install. It will give you a windows installation which will maximize windows netive performance without any complications and will maximize system stability at the same time.

vnidia optimus settings is not the nvidia settings per se. It is that settings that controls the switchable graphics. The BSODs occur during the graphics switch, or during wake up from sleep.