Error 633 refers to the following: "The port is already in use or is not configured for Remote Access dialout." This is typically a hardware issue -- try removing and reinstalling the modem and then re-creating the dial-up connection. Check out MS KB article 162293 for more information: http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q162/2/93.asp&NoWebContent=1.
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