You should at least know your operating system..

A flavor of Windows, or MacOSX?
If you are on Windows, you can right-click on your
My Computer icon, click
Properties - your processor type and amount of RAM will be displayed under
Computer: on the General tab. To see your video card, type
dxdiag into the Run command, and look at the
Display tab. The name and approx. total memory are the important bits.