I accidentally disabled adobe flash player how can i enable it?

well my sister was on a website and every time she logged in a window popped up saying: "the run-on adobe flash player has encountered a problem and needs to close internet explorer" or something like that and it happened like 3 times. so finally at the bottom it said dis able adobe flash player and i did hoping it would work. but now i can't do anything! no youtube or anything. i tried installing it again but it doesn't work. what should i do? how do i enable it again? i heard that you hae to un-install it and a bunch of stuff but isn't there a way to just go back to the window that i disabled it at???
 
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