Multiple displays, as in two or more monitors.
The easiest way to check these things is if you post a dxdiag log as described below.
Windows XP: Go to your start menu and click on run. Type in "dxdiag" and hit enter
Windows Vista / 7: Press the windows key on your keyboard or
click on the start menu. Type in "dxdiag" and hit enter.
Now click on the button that says "save all information".
It will prompt you to save a file. Save it where you can find it.
Then zip the file
and attach it to a reply in this Thread.