WoW Bsod [win7 32bit]

I am having an annoying problem, [sorry long post]
my pc is a bespoke one from dinopc.com, it was purchased san OS so I have installed a full retail version of windows 7 home premium. here is the history so far.
Last Saturday [13th march 2010] Pc crashed while playing World of Warcraft, Bsod, with the message "IRQL_NOT_LESS_THAN_EQUAL" and a few lines of error code which i noted down, proceeded to reboot using the F8 and "repair windows function" the machine proceeded to go through the motions of telling me that recovery could take several mins etc, after an hour it displayed a message to the tune of "cannot repair error please send info to microsoft for solutions etc"
so i did a hard reboot, after F8 gave me another Bsod and the message "PROCESS1_INITIALIZATION_FAILED" more lines of code [again noted]
Called dinopc.com on the monday and followed a few instructions from the techline, this time the Bsod stated "MEMORY_MANAGEMENT"
So techguy asked me to remove the RAM [4GBin 2 rows] and test 1 stick at a time to see if it would boot, success...! so sent other 2GB of RAM to them for test and replace. all done eh, or so i thought......
many apologies forgot this part. after memory sorted out [so i thought] i had to do a complete re install of windows 7
Tonight [sat 20th march 2010] again playing WoW crashed again, this time after MoBo splash screen it just says "BOOTMGR. image is corrupt. The system cannot boot." so cannot even get onto anything else..
So i have read on other forums of other peeps having major crashes with WoW, is this possible that a game can do so much damage?? Or is the cause more likely to be a faulty Pc, please help as i am getting really close to throwing £350 worth of Pc out of the bedroom window.....

Sorry ment to add, the machine i am currently on is not the one in question, the "faulty" one will not boot

I'd try this free, bootable hard drive diagnostic procedure: HD Diagnostic (read the details at the link)