My system specs are:
AliveXFire-eSATA2
AMD Athlon x64 4400+ 2x2,4 GHz
4gb ddr2 2x2gb
nvidia 9800 GTX+ 512
usb mouse PS2 keyboard (Microsoft)
TP LINK Router wireless internet

just to mention. If I remove one memory slot everything goes fine, so that must be some memory compatibility problem. I run Windows 7 32 bit version, and everithing is OK. When I try to install 64 bit version, after finishing installation my PC rebotes and before the screen that should load the windows and where I should enter my personal information the blinking Windows logo freezes and all I can do is to manualy restart the PC, and after restart everithing repetes.
P.S. Sorry about my poor English