Did you try Control Panel > Add/Remove Programs?
I would first see if Silverlight is included as an Add-on in your browsers, and if so, disable those first.
Any reason why you want to remove it?
Mark
How do I remove a corrupt Silverlight installation? Ver. 4
Thanks for info.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic