Sound not working & iTunes won't play & Netflix error

Sometimes my sound stops working, and songs on iTunes won't play when this happens. Also if I try to watch Netflix an error message comes up: "Netflix Playback Error N8157 3140" and it says it could have something to do with my Silverlight plugin.
This is what it says:
The error you're seeing is related to the Silverlight plugin, which Netflix uses to play movies and TV shows on your computer.
This error is usually caused by one of two things:
A computer setting preventing Silverlight from storing files it needs to play your movie or TV show
An issue with the Silverlight plugin itself
To fix this error, follow the steps below for your Windows or Mac computer.
Reinstall your audio card drivers 
Your audio card drivers may be out of date or corrupt.
Uninstall and reinstall your audio card driver. Your owner's manual or audio card manufacturer's website can help.
However, I have tried deleting and reinstalling silverlight, but it doesn't make a difference. Does anyone know what I can do to fix this? It only happens sometimes, other times I have no problems and it works fine.

Back up all data before proceeding.
Triple-click anywhere in the line below on this page to select it:
~/Library/Application Support/Microsoft/Silverlight
Right-click or control-click the line and select
          Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item selected. Quit the application if it's running. Move the selected item to the Trash. Relaunch the application and test.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination  command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.

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