BSOD on new system build - Driving me crazy

Hi,
This BSOD is really twisting my melon! I built a new pc about 4 weeks ago now and it hasn't been stable since.

Pentium D 915 2.8Ghz
Asus P5B-E (and now P5W DH)
2x 1GB Elpida DDR2 RAM
Asus x1650 graphics 512MB (now powercolor x1950 256MB)
2x WD2500YS AHCI mode
Not Overclocked

I have tried clean installs of winxpsp2 and vista. I've swapped motherboards and graphics cards too. Interesting to note that the problem went away for about a week after i swapped out the graphics card, so i thought it might have been dodgy. But now the problem is back with avengence! :( I have tried disabling most thnigs in the BIOS of both motherboards including sound and LAN. Have also tried giving the CPU and RAM a little more juice.

I have run memtestx86 all day without errors. I have run prim95 and 3dmark all day fine too. It's so random in that it will do it very often for a while, then will go away for a bit. Today I've had to have 3 go's at writing this new thread!

I will attach a couple of WinDBG analysis files. Let me know if anyone needs anything else? I'm hoping someone can get some idea of what these minidumps are telling me? To me they look kinda random. Although I have seen the win32k.sys one a few times I know - obvisouly these 4 dumps are 4 of about 60 that I have had in total I would guess.
 
As Memtest isn't perfect, take out one of the sticks of RAM and see if it still crashes, if it does then run the other stick by itself. Three of the dumps have crashed at IRQL 1c and this is almost always hardware related.
 
Hmmm... I have just taken one stick of RAM out. System has been stable for about an hour. I tell you I will be very peeved if that is the problem! lol. I was trusting memtest there!

Regarding the AHCI. I have actually tried both. They're wrong in that thread about being able to change between AHCI and IDE. You can do it - theres a workaround somewhere.
 
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