Help with Diamond multimedia XS51

[Sage41103]

i just bought a diamond mm 5.1 sound card, the XS51. i put it in, installed drivers, and everything seemed well, until i tried to play any kinda of games. windows media player sounds great, all the little dings that windows makes, work. but there is no sound in any games. i dont understand what is causing this, but it wont let sound work on Teamspeak either. im tryin to play call of duty 2, but its hard with no sound :( anyone have any ideas?

[NooNoo]

Welcome to Windrivers Sage

This game plays from a CD? Did you connect the CD output wire to the sound card? If not, you can still have sound from the CD - you need to set the audio to digital. To do this,
open my computer,
right click on the CD or DVD drive you use to play your game,
Select properties, the the hardware tab of the window that pops up.
Now highlight the cd/dvd drive again and click the properties button.
On the window that pops up, select the properties tab.
At the bottom there is a check box - enable digital cd audio for this cd rom device (yes even if it's a dvd drive it says cd). Check it. Click OK, then Apply and OK on the on previous window.
You may need to reboot for it to work.