I have an Asus G51VX gaming laptop ( Core2Duo T9600 with Nvidia GTX260M Win7 Pro and 4 gigs of ram) that I got 1.5 years ago. It used to chew through games without sweat but because of grad school I have not played on it for at least 6 month. Yesterday when I fired up BF2 singleplayer I've noticed that my game starts with 99 FPS but 5 min into the game the FPS rate drops to 15 even if I stay just in respawn zone. More importantly, I used to pay FSX at High graphics settings with DX10 but now my FSX frame rates stay constant at 5-10, which is unplayable. My computer also compleatly crashes completely (I need to pull the battery out to restart it) two min after I try to install older games like Age of Empires 2. The fact that my frame rates drop and crashes occur a couple minutes into the game is strange.
I have tried the following
1) Norton Virus scans
2) SpyBot spyware scans
3) removing all startup programs in msconfig
4) installing newest Nvidia patches and the ones recommended on the Asus website
5)I monitored process CPU usage with Norton after starting a game and nothing beside the game seems to use more than 3% of my cores.
When I was a serious gamer I used to reinstall my PCs every 6 months - 1 year and reinstalling this laptop would probably fix all my problems again. However, right now I'm writing my graduate thesis and do not want to mess with my research data until I'm finished. So if there is no easy fix for my problems then I'll wait until my thesis gets approved to reinstall this laptop.
Thanks for your help