Adjust Volume when Taskbar Controls Are Blocked

1.     Understand the Risks. there's a good chance you could get into some trouble, but if your teacher is okay with it, then follow the next few steps:

2.     Go to Control Panel, My Computer, or My Documents.

3.     If you go to My Computer or My Documents, click on the Control Panel link on the left frame of the new window.

4.     You will see a basic list of things you can change. Click Sound and Accessibility.

5.     In the left frame, click on Advanced Volume Controls

6.     Check "Mute All".

7.     That is all you have to do.