Sorry for thedelay in responding. There just aren't that many people who do BSOD analysis,so at times we get a bit overwhelmed!
Only 1 Windows updates installed ensure that you haveALL Windows Updates. Most Windows 8.1 system have around 55 or more updates onaverage). Please also install the windows 8.1 update 1. (KB 2919355 ). This Windows 8.1 Update and Windows RT 8.1Update also include security and performance updates, and they must beinstalled for your PC to receive any future security updates for Windows 8.1 or Windows RT 8.1.
Your BIOSdates from 2011. Please check at the manufacturer's website to see if there areany BIOS updates available for your system. Also check the readme file to seeif they apply to the problems that you are having. Please be advised thatflashing the BIOS is a very unforgiving process - and one mistake canphysically damage your motherboard.
Due to the age of the system, it's possible that it's not compatible withWindows 8.1 - you may have to consider moving back to Windows 8 or even Win7 inorder to get acceptable performance.
Also you have only 2 gb of memory installed, this is probably the minimum memory what your system needs for windows 8.1 self.