Have a PE 2850 and I am having a slight issue in that it wont recognize any disc that has 64-bit software on it. I can put a Win Server 2008 R2 disc in and it refuses to boot to the disc. The moment i put a 32-bit disc in it recognizes it and boots to the installation wizard just fine. Is there a BIOS setting to enable 64-bit support that I'm not seeing? BIOS are at the most current A07 revision.