How to uninstall silverlight in Mac OS X

Open a Terminal Windows

Do: sudo bash
Write: your password

Your prompt will look like:
bash-3.2#

Copy & Paste this:
rm -rf /Library/Internet\ Plug-Ins/Silverlight.plugin
rm -rf /Library/Receipts/Silverlight*.pkg
rm -rf ~/Library/Application\ Support/Microsoft/Silverlight

Done!