Adobe Flash Player can be found in Programs and Features but should also have an Adobe folder in C:\Program Files (x86) if using a 64bit system - otherwise it will be in Program Files.
Double clicking on that will expand to any Adobe products you have installed.
Silverlight is bundled with Windows Live Essentials.
MS used to have a Fix it button in an article to uninstall it prior to reinstalling but MS have since withdrawn all Fit its.
To get rid of Silverlight you will now have to uninstall Windows Live Essentials.
However, Windows Live Essentials also includes Windows Live Mail and Windows Live Hotmail - both of which use Silverlight.
If you use either of those emails then you will need to retain Silverlight.
This article lists what Windows Live Essentials included, but you can uninstall Windows Live Essentials then Google for any of the single items to download/install as required.
https://support.microsoft.com/en-gb/help/2434419/windows-live-essentials-2011