Where do I get plug-in at?

I had to reload my hard drive back to when I first started it. And now I can't play my 3D games that came with my computer. Also when I try to start any 3D game the games go to the internet connection and turns it on. Once it connects there is a screen that comes up and there is a puzzel pieace that appreas and states that you need a special plug-in to play the game.Please hepl!

#2
Also how do I take the 3D games off the internet connector and back to the regular start up? Any help will be grately appreciated. Thanks!