|A sound adapter, or any device adapter, that's built into the mboard and is not physically removable IS NOT A CARD ! |
You CAN disable the onboard sound by either disabling it in Device Manager or by disabling it in the bios Setup settings, but you don't need to.
Windows 95 and up allows you to have, and to install the software for, more than one sound adapter, but Windows can only use one of them at a time.
The sound adapter device you installed the software for last becomes the default sound device, whatever that default sound device is, is the only one listed in Device Manager, and no resources, other than hard drive space if software was installed for it, are being used for any other sound device you have.
If you want to change the default device, if the software for the device has been installed, you can do that in Control Panel - Sounds and Audio Devices
(or as Mavis007 said - click "start" run (type) mmsys.cpl [press enter] to go to the same place )
under the Audio tab.