Regular BSOD during busy tasks and constant WoW Crashes since Win 7

Hi There,
I am unsure if you can help me with this issue which i have had to put up with for nearly a year.

I built my own computer last January and installed Windows Vista first and everything worked fine but then I upgraded to Windows 7.

In the beginning it worked great, I did get the common problem of every kind of browser crashed every couple of hours and sometimes refused to load up again but i persist and put up with it.

Then over the past 3-4 months, I have been getting regular BSOD - They used to be very similar screens and i am not fast enough to jott down the error codes sadly.

I maybe receive 2-3 BSoD everyday and the most common issue i am experiencing is when i play World of Warcraft - since these BSoD began, this has been crashing a hell of a lot as well. I cant get an hours play on it without it crashing with the same issue.
I put it to the forums with this error log Wow Crash 2/1/13 - Pastebin.com and was told to carry out some actions to see if this could resolve the matter which it did for a very short period of time (ie a day) and then came back with its constant WoWcrashes and BSoD

The BSoD happen when im on and off the game - a lot of the time its when a lot of processes are running, ie several tabs open in my browsers, spotify playing and maybe a couple of folders open - its as if it cant handle it running.

I have tried to search for my dumplogs, i was told it was in %systemroot%\minidump but its empty and there are no .dmp files on my computer except warcraft ones.

can anyone give me any advise of what possible areas i can look at to sort this issue out - i paid nearly 1.5k building my first computer after researching what would be best and im about to break it all up and buy a pre-made one because of the hassle this is now giving me