Thank you for the update.
We can clearly see that the bluescreens are being caused by the nvidia graphics driver.
Uninstall the existing video drivers from device manager and programs and features.
Restart the system and perform a clean install of the driver from the vendor site - http://bit.ly/1YpNLLv
Once done, kindly run a stress test on the system - http://dell.to/1NEc1Y4
If the issue persists, I would suspect the graphics card to be faulty. You would then need to replace it.
Let us know if you have any other queries.