BSOD - nvlddmkm.sys / dxgkrnl.sys

Hello and welcome doing I don't know jhow old your machine is so one thing it looks like you have not tried out is the PSU.
Now I have two options to view to see if the power output

Using HW Info PSU

Download HW Info and pick the right bit version - HWiNFO, HWiNFO32/64 - Download -(copy and paste this site into the search bar) If you do not need the running information in the smaller right hand panel close it. In the left hand window click on the + for the individual device groupings and they will open out to the various components.

Go on opening out further until you get to the device itself. click on it and it will highlight. In the right hand window there will be a very detailed description of that device as in brand, speeds model number etc etc These are very detailed and are just what is needed for searching for drivers etc.

See my pic for an example - in this I have shown my power but it is a laptop and a desktop will show more details if you scroll down that listing. Now if your mobo is an Asus scrolling down that Sensor listing you might come across a section titled FINTEC that is the section which will give you the rail voltages and the BIOS battery called Vbatt

An alternative is this bit please use a digital meter and NOT an analogue one as they inject typically 9v into a circuit to test it and doing that on a 3.3v or 5v rail will not do anything any good!!
PSU - Test DC Output Voltage

Ok mate well that rules out just about the PSU -very nice choice by the way:)

Now where to go next?? Just one question the media you installed the Ultimate from was it retail or an OEM? and genuine Microsoft - not being funny but there are some who buy from sites like Ebay to their regret.

Ok D mate I don't know if you have run any malware scans but if not try these

http://www.superantispyware.com/

http://www.malwarebytes.org/products/malwarebytes_free/

http://www.bleepingcomputer.com/download/adwcleaner/

download from bleeping computer – delete any rubbishthese find.
if these come nothing then use this
Download Kaspersky Rescue Disk 10 just boot from this disk / USB I prefer the disk but.... It will scan from power up and before Windows which isn't involved anyway starts.

Well it has me a bit stumped too now.

The only thing I can suggest now is back up and re install and try using this
Clean Reinstall - Factory OEM Windows 7 cos I suppose there is always the outside possibility that the media you have is corrupted??