How do I know if I have Silverlight installed?

I don't know anything about Silverlight. I don't think I installed it. I recently got a message about a Microsoft upgrade available. If I don't have it, why do I need it?

Type  silverlight  in your Start search box. If you see Microsoft Silverlight at the top, you had it installed.
OR, Start button > All Programs > scroll down to find Microsoft Silverlight. You find it, you got it.

You really don't have to have it.
Here is a YouTube video about Silverlight.
http://www.youtube.com/watch?v=JEUrQEj6Sd4

Google for more information from the web.

t-4-2