Silverlight cannot be updated or removed from software

In the Control Panel, open the Add/Remove Programs applet (Programs on Vista) and
uninstall Microsoft Silverlight if it is shown as installed by clicking on it and then clicking Uninstall or Remove.
If you get an error on this step (for example a dialog saying that the .msi file cannot be found), just continue on to the next step
Note :Be careful that you only delete what I say to delete below.

If you delete too much by accident it is quite likely that you will break something and there is no way to undo accidental changes

ClickStart, and then click on Run.
Type regedit in the Run box and click on OK.
In Registry Editor navigate to
\HKEY_CLASSES_ROOT\Installer\Products\
(export and) Delete {D7314F9862C648A4DB8BE2A5B47BE100}

Using regedit, navigate to HKLM\Software\Microsoft\Silverlight and delete the key

Using Windows Explorer, delete the “Microsoft Silverlight” directory from under Program Files.
From an administrator command shell on anx86 you can do this by running:
rmdir /s /q “%ProgramFiles%\Microsoft Silverlight
If you are on a 64-bit version of Windows, substitute ProgramFiles(x86):
rmdir /s /q “%ProgramFiles(x86)%\Microsoft Silverlight

Try updating or installing Silverlighthttp://www.microsoft.com/getsilverlight

If the issue is related to playing Media Streaming using third party players from any website then try resetting the Internet Explorer to defaults