Installed Communicator 2007 and uninstalled it now coummictor 2005 won't work

Had Communicator 2005 but upgraded to Communicator 2007 did not like it uninstalled it and reinstalled 2005 and now I can't get coummunicator 2005 to work at all get is this error: Cannot sign into Communications server is temporatily unavailable. Please try again later. If problems persists contact your system administrator.

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