You can also try this to find out what your system specs are and if your rig has the beef to run the game you're having trouble with.
This is a link to Can You Run It.
http://www.systemrequirementslab.com/cyri/
Just follow the prompts to install the small applet.
It will also check your drivers. Which should be up to date as long as auto update hasn't been turned off in Windows 7.