BSOD when being idle too long or playing certain games

I have a fairly new bought Custom Build (about 3-4 months old) and it has always caused a BSOD if I leave the computer doing nothing for too long, I know this is not a temperature issue as I can leave it playing music or watching something and it's fine and temperatures never exceed 30-40 degree celcius. Over the past month however I have been having trouble playing all 3 witcher games and sometimes games such as Dark Souls 2 and Verdun where the computer will at random times cause a Blue screen and may not even leave a minidump with information of what has gone wrong, however the most common error has been a VIDEO TDR ERROR caused by the Nvidia driver named nvlddmkm.sys, I have always kept drivers up to date and have tried many different ideas in order to fix this error including making a nvlddmkm.sys.old file and using CMD to recreate it. I have done full scans and have found no viruses within the desktop and have no other faults other than trying to play games...on a gaming desktop! I have run the dm log collector and left the file attatched so that it can be looked at and will also leave a link to the spec and website where the desktop was bought from. I know the BIOS has not been setup up fully for this build and has been left for default however I know near to nothing on how to configure this and was not sure on the consequences of this. Thank you for anyone who has the time for this. :)
Intel Core I7 4790 2tb + SSD 16gb 1600Mhz GTX 970 4gb Kryptonite Windows 7 PC