Where is the problem

I have build two identical computers the parts are:

mb: asus maximus formula
cpu: Intel E8400
gpu: gainward 8800 gt
memory: corsair pc 6400 2x2 gb
hd: western digital 500 gb

one works great, but the problem is with the other.
First i installed vista-64, but it was very unstable, first time it crashed when I was installing drivers for motherboard. I tested with another cpu (celeron 1,6) but it was still unstable, so I used the celeron and flashed the bios to 0907, but the windows was still unstable, and with blue screens. Then I changed back to E8400, and install vista-64 again, but it was very unstable, sometimes i could run 3dmark06, then i tried it again with blue screens. I tried to take of one of memory modules, it did't help, then I tried the other, still the same. Then I try to install the operating system again, but from now on little before it finished i got blue screen, i tried with different hard drive, different graphics card.
Then I think i was the motherboard, so I send it back, but today I got e-mail from them, and they tested it without problems.

So what more can I test?

Sorry for my bad english.

Yes, but I don't get to windows any more, and the other system which is identical works fine. I have all the drivers for vista-64. But I get blue screen before it has finished installing windows, usually where it finalize the installations and the last restart.

I had a very similar issue with my striker/vista64 first time, it was the Memory…

I don’t suppose you have a 1gig stick available?

In the end for my issue I had to install with 1gig Ram, then add the others 1 by 1.. It took me forever to figure it out.

*edit*
Microsoft made a patch
http://support.microsoft.com/kb/929777/en-us

I took the memory att put in the other computer, and they works great in it, so it is not the memory either.

Why use Vista at all?
XP w/SP2 built in is $89 USD and is faster than Vista and has no problems.

Also if both systems are the same CLONE the working systems HD and see if you still have a problem with the non-working one.
Also clear the bios on the bad one.

I test some more things when i get back the motherboard, if I can't find the problem then, I will go back to the store with all the components, the good thing is that they came all from same place.

Well I like vista a lot more than xp, I don't ever want to downgrade back to xp.

Is Vista 64 bit on both computers?

http://www.anandtech.com/casecooli [...] spx?i=3071

Yes but i have tested with different gpu, hd, the memory is now on this working machine. Even different cpu. The only thing i don't have tested is dvd-burner and the cables for dvd and hd, and psu.
I have send back the mb, but in the store they tested it, and they say that it works fine. bios i have resetted many times. But when I get back the mobo, I test some more, if it don't work, then I take all the parts to the place of purchase. So they can find what the problem is.

Try 1 stick of the Ram from the other computer...

** I understand there is nothing wrong with the ram, but perhaps for what ever reason it is just being picky during install.

I think I will test tomorrow the gpu in this working machine and perhaps the hd and install windows on that, because the other system is exacly the same. If they work, then there are less possible faulty components to look at.

When I have installed windows then I installed the drivers for motherboard. After it has installed the chip drivers, the computer reboot, the it ask if I want to make raid disk, there is three choices 32 bit, 64 bit or dos. But if I don't want to make any disk, how can I proceed. If I restart I came to same place, with maximus formula, I resetted the bios, then it worked, with this new motherboard, I flashed the bios, and after that it worked. But there should be some easier way.