Are you talking about the Xonar Phoebus?
What drivers did you install?
What is your setup, what speakers and/or what headphones(set)?
How did you connect those speakers/headphones(set)?
What are your settings in the Xonar and Windows control panel?
What did you try already to solve this issue?
Describe your problem as detailed as possible
You have to put a bit more effort into your post and give us more information to work with if you expect any real help.