When you try to uninstall Silverlight via Add/Remove Program you were prompted by one of this error(S):
“No valid sequence could be found for the set of patches“
“The feature you are trying to use is on a network resource that is unavailable.”
1. Close all open Internet Explorer.
2. Delete the following registry entry: HKEY_CLASSES_ROOT -> Installer -> Products -> D7314F9862C648A4DB8BE2A5B47BE100
3. Install the latest version of Silverlight.
No need to restart the machine.