I have a MS EXCEL (built with Excel 2007) pivot file which connects to a MS ACCESS database (built with Access 2007) and a couple of users are getting an error message that reads "could not find installable ISAM" when trying to refresh. I have hundreds of users using this file and refreshing without issues so I dont believe it has anything to do with the connection string. Everyone is running Windows 7 and either Office 2007 or 2010. It works for both versions, except for these 3 people.
What could possibly be missing on these users machines?