I've AMD 1055T X6 2.8ghz, 8GB DDR3 RAM, MSI R7770 1GB DDR5 Graphics card, Cooler Master 600W Extreme Power PSU. This is a pretty good conf. for smooth gaming at full hd resolution. I'm using Windows 8 enterprise edition which is working pretty smooth. My problem is that whenever i game, the fps varies drastically from 50-60 to only 7-8 within seconds and when i minimize the game and check in the task manager, only 3-4% power of CPU is being used and only 2GB of available 8GB is being used. I don't know what's the problem. Please help!!!