How mining on CPU (Windows Server OS) miner not run under windows 2003 server (
Please make sure that you have Windows x64 version if you're trying to run x64 minerd.
Yes, I have ... small home server with Xeon X5650
Your Intel Xeon® Processor X5650 doesn't have AVX Instruction Set Extensions.
Try to run minerd-x64-corei7.exe for example