Hi,
yes I did it so. My first idea was to switch the memory modules to test if one is broken, but my problem was that you can only reach one without seperate the whole notebook. So I tried only with one module and it works fine! I think it's possible to run a stable system with only 2 Gig RAM, but why? i bought 4 Gigs

So I insert the second 2 Gig module after Windows x64 installation again and configured the usable memory to 4095 MB. Okay one problem is that Windows now only uses ~ 3 Gig but thats one more than 2 in the other alternative.
Sure I think it maybe a warrenty problem. Finally you not allowed to open the case, if you don't want to lose the warrenty.
(My opinion: "But if you keep with this, you'll not be allowed to change your hard disk drive if you want a SSD or a bigger Disk if you want...")
Removing the memory module (this one) is more or less very easy. I suggest that you remove the battery and then press the power button for ~ 3 secondes to completely discharge the electric components before you start.
You have only to remove the backplate (9 Screws I marked in picture). Then the memory module is locatet on the lower middel part of now visible mainboard. To remove the module you have to move the small 2 pins (I marked them with 2 in the open picture), which fix the module at the left and right, carefully away from the module, till the module flips out.
Yes i contacted the FSC Support to and I get the same answer!!! I think it's a blame for FSC to sell notebooks which makes the user think that you can use 64 bit software (sry, when I see that FSC promote Intel C2D CPU, new 1066 FSB and 4 Gig RAM, then it makes me think that I can use this x64 components with x64 operatingsystems) and at least the user bought a "broken" device. Cockiness!!