You also didn't provide any details for anyone to be able to help you. Are you getting an error message, is so what is the error message? What happens when you try to register? What modules are you running? What template are you using?
Unless you can provide information all anyone can do is make guesses.
First of all, you can try to disable the Captcha module and antispam modules. After clear the template cache and try again. If still not working also disable Facebook module. Don't forget clear template cache every time than you disable a module.
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