Ok if this issue is not fixed this is what i recomend you do,
Firstly Disable all addons DO NOT uninstall them
Keep the added ram out of your system as that is most proberly what is causing ur BSOD
Uninstall all software for your Graphics card
DO NOT REBOOT
make sure your graphics card is removed from Device manager
once you have Verified this go to nvidia.co.uk and download and SAVE your latest drivers DO NOT INSTALL,
go ahead and reboot your system
install ur new drivers and reboot again
this should reinstall your gpu and hopefully fix ur problem
test wow for a minimum of 2 hours without addons if all works enable your addons and hope for the best
if this doesnt fix ur issue id sugest running a cpu stress test by using something like cpuz if the CPU is fine replace ur graphics card
get the latest drivers for your card mate personaly i wouldnt get them from nvidia i would get them from
http://www.omegadrivers.net/ they have more of an all in one driver with optimalised settings and use older base files to maximise compatability