You may need to simply UNassociate your .CDA File Type.
DISable Auto-insert Notification (temporarily if you insist on using it).
Open WMP and make sure it's not set as the default CD Audio player;
Go to Folder Options->File Types (one way of getting to that is by running Windows Explorer and look for Tools on the menubar);
Locate the .CDA extension from the list and select it, then hit DELETE to remove the association;
Click APPLY, then OK.
Start WinAmp and make sure that the option to "Associate with Audio CDs" is enabled, then put an Audio CD in your Drive but do NOT play anything yet.
Close WinAmp and re-open it.
Check to see if the option is still checked in WinAmp (it should be).
Press play and voila
This is true in all versions of Windows. If this doesn't work, you can always uninstall WMP