No sound in IE and Mozilla?

Recently i cant hear sound from internet browser for example youtube. however i can still hear the sound from itunes. any solution to this problem?

thanks in advance

No sound in IE and Mozilla?windows xp professional

maybe u disabled them... try googling it

No sound in IE and Mozilla?windows xp home internet explorer

Try this:

1.Open Control Panel.

2.Double Click to open Sounds and Audio Devices.

3.Click Sounds tab.

4.Scroll down to Windows Explorer, which is present under the Programs events.

5.Select Complete Navigation/Start Navigation.

Click OK/Apply.