Volume Control in Win XP

[xyz]

I am using a dual boot system with Win 98 & Win XP. In WIn XP , the MUTE option in volume control is always inactive. I can of course change the volume but can not mute it by checking the Mute box. I am hearing sounds very fine.
What thing is causing the MUTE Check Box to be inacive.
There is no such problem in Windows 98.

 

[gossip5]

What do you mean is inactive?

 

[xyz]

Inactive means that when you click the speaker icon in the system tray, You cannot check or uncheck the Mute box.