Vista BSOD + ram conflict

I just got my laptop back from repair, and noticed quite a few times either on IE or Mozilla, it just froze and I couldnt do anything. I also after this added an extra 2gb ram sodimm (PC2-6400) to the 1gb pc2-5300 one i had. I noticed a few bsods, and used the debugger to analyse the minidumps. It showed a lot of .sys and .dll files caused the error, so I used my vista os cd and the "upgrade" option which i read basically just repairs windows if there are any problems without deleting any apps or data. I'm still getting the same problems though. Vista freezes for about a second or two, then creates the dump and restarts. Could it be the two different spec'd ram modules causing this, or is it a software problem? I've uploaded the debulog file to show what causes the crash if its of any use.

Cheers in advance

 

I think it has to something with microcode update , hmm try this

http://support.microsoft.com/kb/936357

or Do a MemTest

 

Its only got the windows server link...is that the one? Yea im going to run a mem test over night and see.

 

http://www.microsoft.com/downloads/...-8c50-5d039f5d172d&DisplayLang=en