Hello, I've made a clean install of Windows 7 Ultimate a few days ago, and I started to encounter the following problem after 30-60 minutes: It usually happens when I'm running a computer game (any game), I experience a sudden fps drop, even though before that, on maximum quality the game was running perfectly, becomes unenjoyable, quit the game. The CPU meter gadget shows 100%, and even after I close everything, browser, windows explorer, the best I get at idle is 70-80%, and if I try to open anything at all, it becomes stuck at 100% again. So I open task manager and go processes, put them in a descending order of processor usage, and see that they nowhere near add up to 100%, even though at the bottom the task manager says CPU usage is at 100%. Phyiscal memory is usually around 20-60%, no problems with that. If I go to Performance tab, and click on resource monitor, I experience the same thing: the actual usage is nowhere near 100%, I can't see any processes that would explain for the performance drop, in fact the highest demanding process is the resource monitor itself. The problem presists until I restart the computer, shutting down takes much longer now. I've been trying to find a solution online for two whole days now, it's very frustrating. It's a HP Compaq 8510w laptop with Windows 7 Ultimate x64 Build 7600 Intel Core 2 Duo T7500 (2.2 GHZ) Hewlett-Packard 30C5 (Intel PM965 (Cresline-PM) + ICH8M-E) 4GB memory nVidia Quadro FX 570M [HP] Intel 82801HB ICH8 - High Definition Audio [B1] I've tried several suggestions: Disabling HDAC in Device Manager (High Definition Audio Controller) Disabling Audio Enhancements in Sound>Speaker Properties Installing the very newest drivers, including chipset drivers Running programs in XP compatibility mode Disabling the gadgets I've no reason to think I've been infected by malicious software, I can't find any suspicious processes running. Anything else I could try? This is driving me absolutely mad.