submitting infopath form to access database yields "provider" error

All workstations are running XP SP2.

When submitting an infopath form to an access database we're finding that it works on some workstations but not on others and cannot figure out why.  We have found workstations that seem to be identical (having the same version and service pack of InfoPath) where the form will successfully submit on one while giving this error on another.

"InfoPath cannot submit the form. An error occurred while the form was being submitted. InfoPath cannot connect to the data source. Provider cannot be found. It may not be properly installed."

Both the form and the database are located on a network share.  This share is accessed as a mapped drive on all workstations.

What provider is this error referring to?  How to fix?
uncpaissAsked:
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Clay FoxDirector of Business IntegrationCommented:
Is it the same mapped drive letter?

In Internet Explorer is the server in your Local Intranet security zone?

IE is used for data connection security.  This can break data connections and is something to check.

Open up Internet Explorer tools and check the sites in your zones.
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Clay FoxDirector of Business IntegrationCommented:
Another test would be to design a form on a problem client.

See if it works in designer. Modify the main Data Connection and see if you can complete it.

http://www.u2u.info/Blogs/Patrick/Lists/Posts/Post.aspx?ID=1627
Here is another post to review.
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uncpaissAuthor Commented:
Regarding the settings in IE, we have also seen a different error "InfoPath cannot submit the form. An error occurred while the form was being submitted.  InfoPath cannot connect to the data source. Safety settings on this computer prohibit accessing the data source on another domain."

In those cases, adding the file server to trusted sites and enabling the setting in IE for 'Access data sources across domains' fixes the problem.

However, doing both of these on the "problem workstations" mentioned in the original post has no effect.

Regarding the mapped drive letter, both the form and the db are in the same directory (so , yes).
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Clay FoxDirector of Business IntegrationCommented:
Here are some troubleshooting techniques.

Try a new sample form to see if a different form works.
Try another user account on the same machine
Try repairing Office and make sure service packs and patches are installed.

So form, user environment, or computer, where is the issue?
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