Things are not so diffcult as those internet users describes.CPU:Intel Q9400
RAM:Transcend DDR2 800 - 2G * 4
Display:MSI 9500GT 512M
HD:WD 320GB * 2
First at all, download and update ASUS BIOS updates from ASUS website and update your BIOS to newest version. This is mandatory (I stuck here for almost one day), at this time, newest version should be 1409.
Then bootup with Vista install CD(I am installing Vista Ultimate 64 bit version), follow the instruction to setup Vista
After installation completed, reboot with Windows Server 2008 CD, following the wizard to complete server 2008 setup process.
Once the installation is done, reboot your machind and you’ll see both Vista & Windows 2008 are listed on bootup menu.