Normally when I was clicking volume slider I heard one of windows sound in my external speakers with volume depending on its position.Then something happened (I,ve installed something maybe)and when I click the volume slider I hear system beep not from external speakers but from speaker inside computer box.The volume of it doesn't depend on slider position.Could someone help me.

I have just found solution in the internet.There is a registry patch fixing my problem.It adds missing position to the Control panel-Sound and audio devices-Sound.This is "Default sound".After double clicking the patch new position is entered to the registry.Restart your system, go to Control panel-Sound and audio devices-Sound and choose for "Default sound" ding.wav.For the patch please email to me. This is patch content: Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\.Default] [HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\.Default\.Default] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,6d,00,65,00,64,00,69,00,61,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,\ 77,00,73,00,20,00,58,00,50,00,20,00,44,00,69,00,6e,00,67,00,2e,00,77,00,61,\ 00,76,00,00,00 [HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\.Default\.Current] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,6d,00,65,00,64,00,69,00,61,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,\ 77,00,73,00,20,00,58,00,50,00,20,00,44,00,69,00,6e,00,67,00,2e,00,77,00,61,\ 00,76,00,00,00