I've had that problem and fixed it. Can't tell you how because there is no
rhyme or reason to it. I would remove the card, boot up to safe mode. Remove
all software and instances in the system proerties of anything to do with
sound cards. Leave the card out and reboot. Reinstall DirectX through the
windows update/ installed updates and then reboot. Go to the start menu and
type in regedit and go to the edit column on top and select search. Do a
search for Diamond and MX400 and Aureal and remove most, if no all keys. If
you are not sure leave it there but it may not work. If you have Norton
System Works you can avoid that by doing a scan, which will remove all
entries not needed. Reinstall the card and reinstall software and it may
work, notice I said may. (-:
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Michael K. Grandy
NonStop East LLC