Facetime now says Lion is too new for it to run. Same from Apple Store

So I accidently screwed up my system and had a do a restore from a couple hours earlier. Everything works fine, but when I run Facetime I just get a camera with a circle and line through it. I pulled it out of the Applications file and tried to reinstall another copy of it and it says that my OSX [Lion 10.7.5] is too new for it to run. I've also noticed that the app icon for it has a circle and line through it like it's not runnable under this system. It works fine with everything else except photobooth which just spins and spins and nothing happens.

Any ideas?

Eric