Chaos Theory works great. I have no problems so far. But on the Original and Pandora Tomorrow, during single player play, whenever I stop moving Sam Fisher, he keeps walking even though I've stopped controlling him. Sometimes, the camera spins around whenever Sam stops moving or hits a wall. This is very annoying.

Also to note, I don't have any controllers, gamepads, or any other peripherals installed or plugged into my PC. Also, I turned firewall and other virus/adware softwares off. I'm not even online. AND importantly, I switched all the USEJOYSTICKS to False. Still the problem lingers.

I have no idea what's going on. Do you think it's my drivers that's causing this? Are these games too old for my PC since Chaos Theory seems to work great.

Any help or suggestions would be much appreciated. Also, if anyone experienced similar problems, please post them and what you did to fix it. Thanks.

Maybe some microwave or something is interfering with your wireless mouse or keyboard signal. (if you have wireless mouse or keyboard).
Apart from that I have no idea. Did you try a reinstall?

try turning your click lock off i cant remember how to do that now,you should have hot keys disabled as well.