I have a
Gateway Media Center PC 880
with Intel® 915 Express Chipset Family
onboard High Definition Audio - Realtek 880

How do I get this working with Avid? I am getting the 

ADM_DSOUND_MIXER_ERROR

Tried uninstalling and reinstalling audio drivers
Avid works fine if I disable the audio drivers

Avid News

5.1.6 is available

A new update is available for Avid Xpress Pro HD.  5.1.6 fixes a few
bugs, as you would expect.  One significant improvement is that Xpress
Pro now works with Realtek High definition audio cards.  Before 5.1.6
if you had this kind of audio card in your system you would load
Xpress Pro HD and it would crash.  Now it works.   This was something
of a problem because many motherboards now come with this type of card
built-in.  It was not a problem on desktops, where we would always
recommend you add a sound card anyway, but was more of a problem with
laptops, where it is a lot harder to add another sound card.  We do
have a good option for an additional sound card for a laptop, which is
a PCMCIA SoundBlaster, which will give you decent quality sound and
surround sound output, but for most people this was an unnecessary
expense.