[Zope] zope under nt w/ ie5 as client

Had zope working GREAT under nt with ie4 as browser. Did the upgrade to ie5 and now cannot access the management screens. The following error is displayed. Zope still works for ie4 from other machines. Any Ideas? Karl Putland HTTP Error 401 401.5 Unauthorized: Authorization failed by ISAPI/CGI app This error indicates that the address on the Web server you attemped to use has an ISAPI or CGI program installed that verifies user credentials before proceeding. The authentication used to connect to the server was denied access by this program. Please make a note of the entire address you were trying to access and then contact the Web server's administrator to verify that you have permission to access the requested resource.