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How can i un-jailbreak my iphone 4 IOS 1.7.2?

I have jailbroken my iPhone 4 yesterday.
Today, when i tried to open an app, it automatically close. I can't open facebook, instagram, i can't send messages, i can't even open the Cydia app!
I also tried to restore my iphone, clearing al in it, but when it starts to restore appears a loanding circle on the screen and it doesn't stop anymore. I let the iPhone restoring for 7 hours and the loading circle stayed there.
HELP PLEASE!!!! What can i do??