How to remove stubborn plug-ins?

[Knight]

I don't want to use some plug-ins with the program I downloaded. I want to uninstall them using the uninstaller feature. But I can not find them in the Windows
Add/Remove Program list. What can I do now? They really bother me.

[Ocean's one]

They are hidden programs and secretly installed in your system, which will slow down your PC. If you don’t get rid of them, your PC will probably some day. To remove these plug-ins completely, you can use Perfect Uninstaller. Perfect Uninstaller can remove applications that can't be uninstalled by the standard Windows Add/Remove Programs, clear registry entries and drivers that the applications left and show detailed information of a certain application installed in your computer. You can free download it from Perfect Uninstaller - A Better and Easier Uninstaller