[JohnR]

Originally Posted by Thunder Rod

Don't know about Antec, but the Dell should be pretty straight forward. Try the link provided here for the Dell SigmaTel Widnows XP download:
dimension E510 audio problem - Desktop Audio Forum - Desktop - Dell Community

Good Luck.

Jimmy - what TR said above. If that doesn't work (and you bought the optional sound use this link and go with the Creative Labs Driver: Drivers & Downloads )

But do TR's first.

If that all doesn't work recheck your system tag as the one you posted did not work.