Windows 7: BSODs all over. Shiny new computer

Hi
I have bought a new computer, thinking I could save some money by building and configure it myself. I happily installed Win 7 and booted - yay evereything works fine.. until BSOD and BSOD and BSOD all at random, even before installing any software.
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Windows 7 - Version 6.1.7600 build 7600 x64
Gigabyte EP45-UD3LR
Intel(R) Core(TM)2 Quad CPU Q9650 @ 3.00GH
ATI radeon HD4870
3x A-data 2GB DDR2-1066+ plus series
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Ok, my trials:

• windows problem - reinstalled windows. No change.
• driver problem, probably graphic card. Downloaded latest ATI Catalyst. No change.
• HDD problem - tested drive with WD Data Lifeguard Diagnostic. No errors.
• windows problem (again), tried sfc /scannow. 2 files couldn't be restored: something with quarantine proxy
• memory problem, ran memtest86+, found a problem and found one stick with issues - removed it. No change.
• since the minidumps often points at "memory_corruption", i thought memory bios settings.. changed bios to "fail safe". No change.
• changed RAM timing and voltages in bios to manufacturer rated 5 5 5 15, 2.1V. No Change, got a feeling the BSOD's came more often though

BSODS occur as frequently in windows safe mode.

An excerpt of the minidumps, from Windbg:
minidumps:

MSinfo32 and Minidumps attached

any idea how to proceed?

Isn't building a blast? Hope you haven't installed too much and can easily do another clean install.

A new install should not result in your sfc/scannow results. Eliminating those errors are your first step. Since you believe you have a bad mem stick, removing it doesn't fix any corruption that may have occurred in the original install.

Therefore I would check for a bios upgrade, do not install the mem in question, boot to a memtest disc and run 4/5 passes, and then reinstall the OS.

I know it's a pain in the a$$ but proving/validating hardware will save you a lot of future grief!

so if I understand you correctly (?), the actions you suggest are:

1. upgrade bios
2. run memtest again, without faulty RAM-stick (this I have already done - no errors)
3. reinstall windows

edit:
ps. why bios upgrade? ds.