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Excel connector login error

I have recently installed the excel connector PE on a new system.  It works fine on my system at home however i am having problems at the office.  This is the error message
Salesforce: login()
unknown error
Object variable or With block variable not set
Has any one seen this error before?  I havent been able to find any other postings on this.  I have reinstalled the connector and diligently followed the recommends for intsalling an add-in and removing toolbars. 

Please help...
I am getting the exact same error - and i traced it to the salesforce.serverurl not being populated.
How should this get set if not in the options, should there be a login dialog form?