Lag on All Games in Library except Deus Ex (Rendering)

Hi all.

Whenever I seem to have games running whether in the menu or actually in game, there seems to be lag. This is with or without mouse movement.

I mentioned that it’s not the case with Deus Ex because I was able to change to a compatible software renderer in the game menu. I don’t seem to have this option in the other games.

Does anyone have an idea how I can fix this issue?

Games that I have that are experiencing this issue are L4D2, System Shock 2, and Morrowind.