I have a windows XP OS, im using the default SoundMax card with fully updated drivers. I havent ever had one instance of lag. (well okay so my computer slows down when i zoom in on a nuke explosion) Other than the crashes the game gives me no errors. I have used another trainer and it works nicely. My videocard is an ATI X1600 (or X1650).
The problem only occurs when i use instant build and/or instant sidebar abilities.