I've been trying to troubleshoot a very sluggish Windows 7 install for a couple days, and need help finding the cause. The culprit according Process Explorer is that the System Process runs at 100% CPU usage, and when I view the threads, it's actually dxgmms1.sys that's doing it. Does anyone know what that file is (guessing something DirectX related) or how I might be able to fix it? I've tried 3 versions of the nVidia drivers (182.50, 185.81, 185.85) and even tried the Vista drivers. All with the same outcome. This is a Dual-Core Xeon, 4GB RAM, Windows 7 64-bit; nVidia Quadro FX 3400/4400. Thanks in advance!