Silverlight update problems and old version won't uninstall

I "upgraded" from 7 to 10 a few weeks ago, and since then have been getting errors saying that Silverlight updates are failing. So I researched it on the web and tried uninstalling the old Silverlight manually using Control Panel, while downloading the latest to replace it afterwards. But the old one, dated April of this year, will not uninstall. It tells me that the uninstaller does not have sufficient privileges to uninstall it. WTF?!

Oh, I found it. It seems that you have to close ALL browsers, before it will let you UNINSTALL Silverlight. So I managed to uninstall and install the latest.