The thread I posted link to is a possibly solution for howto to remove the volume control. There's as stated in the link a native policy setting to remove volume control when running atleast Windows Vista, but not for earlier version as Windows Server 2003. In Windows Server 2003, you nead to create a custom administrative template that configures the registry value.
Volume control is sndvol32.exe and to prevent it from being used, you can configure its NTFS-permissions to prevent the users access to file. File permissions can be configured through GPO (Computer Configuration\Windows Components\Security Settings\File System)
Another GPO solution would be to create a Software Restriction Policy to prevent sndvol32.exe from being started.
If you as stated in delete request figured it out by yourself, please post the solution to let others know what you did instead of just deleting the question.
