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.
dxdiag
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.