You'd need to provide at least some information.
Has Outlook ever worked? If so, what steps produced this error? Are you
using Exchange Server or a local information store?
There are innumerable causes for this error.
--
Russ Valentine
[MVP-Outlook]
"Tammy C" Tammy wrote in message
...
Trying to enter new contact name in Outlook 2003. Get error message of one
or
more parameter values are not valid.

I get the same message when trying to import or export also.