And if you don't know, go to the Help and Support section then go to the Computer info page. If you don't find what you are looking for, search in the Help and support menu.
You get there on your Start menu.
Are you running any kind of DVD emulation software (like Alcohol 120)? You might want to look at the SecuRom website to see if they have a list of applications that interfere with SecuRom. Also, try uninstalling and re-installing the game to see if that helps.