My motherboard is ASUS P5N-E SLI. The processor used in that is Intel Q6600. There is 4GB RAM installed in the same. I also have a GPU which is ASUS 7300GT. There are two card with 2 hard drive. I had installed Windows Server 2003 on the same. I had installed three OS on it. On the second drive there are two partition in which there is Vista on the one side and Windows XP on other. Both are 64bit OS. For Vista all hardware is installed and it is working fine while there is some issue with Windows XP. The problem here lies with the second drive which has Windows XP x64. In Device Manager there are 4 devices which are listed has unknown. I tried to check the same by connections but nothing worked out. I had downloaded all the drivers from official Asus website and thought this would be working fine. But nothing happened.