Volume keys & mute the keyboard has stopped working

Title keys: Volume & Mute original
Windows 7: the volume keys and mute the keyboard stopped working on my desktop, only the key works in market/paused.  I'm using the Panel of key Microsoft 4000 ergornomic.  I've tested the keyboard on another computer, and the volume keys and mute function perfectly.  I plugged the cord of the keyboard in different USB ports on the desktop and even results.

Maunally dragging the volume slider is very annoying and the speakers all work perfectly.  No reason for volume & mute keys is not working on my desktop computer?

Thank you for your time to read and answer my question.

Hello

1. don't you make changes on the computer before the show?
2. you receive an error message?

Method 1:
You can download the software and drivers for the keyboard on the manufacturer's Web site and check.
http://www.Microsoft.com/hardware/en-us/d/natural-ergonomic-keyboard-4000

Method 2:
Try the steps in the article of the supplied knowledge base and check if the keys work.

Troubleshoot wired keyboards that do not or only the erroneous characters category
http://support.microsoft.com/kb/258826.

If the problem persists, you can contact the Microsoft Hardware support for assistance.
http://www.Microsoft.com/hardware/en-us/support/contact-us

Tags: Windows

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