Hey Sandra if your computer has auto port scencing (you get a pop up when you plug in an audio device). Then try plugging in a microphone, my computer would not start COD 2 at first then after do some research and plugging in a microphone, it worked with no problems
. also it would be a good idea to download and install the 1.3 patch from filefront.com.
P.s what you plug in does not have to be a microphone just plug somthing into the Mic port and tell the computer it is a mic when you get the pop up