FaceTime used to work, now it will not- any suggestions with issues that changed the functioning of it?   I cannot trash it and when I try to purchase another app for it, it says I have the newer version

I downloaded the FaceTime app to my macbook pro-  it worked great.  All of a sudden, it won't allow me to log in with my apple ID, won't advance to the next screen.
I tried to trash it, won't let me.
I tried to download another from the app store- says I have a newer version
any suggestions how to make it work for me?

thanks for your reply.  I tried this without success.   My apple ID is fine- I verified it and it works.    I sign in and it takes me to the page saying "NEXT" but when I click on that, it takes me back to the sign in page.   My contacts all disappeared.    And I cannot open the FaceTime Preferences pane-  is grey and Not able to be clicked on to open.     My apple ID works but my FaceTime will not.
any other suggestions
I updated to the most recent OS mavericks too

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