I checked out your dxdiag.txt file and noticed that you are running the sessions on a Dell Optiplex using a Radeon X1300 video card. Just curious--are your other systems similarly configured? Any chance I could get a look at the dxdiag.txt files from any/all of the three other machines?

For dxdiag.txt info, see:
http://www.empirisoft.com/medialab/h...e_shooting.htm