If you mean you have the logon screen, but there aren't any users you can select to logon, I guess you've 'hidden' all accounts from the welcome screen.
Press ctrl-alt-del twice, so you'll be able to logon again, and undo the hiding of the account, or disable to welcome screen.
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Several security vulnerabilities in Firefox and the Mozilla Suite of Internet software put users of the open-source products at risk of hacker attacks, the Mozilla Foundation is warning.
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