Installation error: Running the wrong version of SharePoint
In an earlier post (http://powerpivotgeek.com/2010/03/04/installing-the-right-version-of-sharepoint/) I spoke about the way that PowerPivot determines if you are on the right version of SharePoint. Cory Retherford reported some errors and after investigating it for a few days we found the solution.
Here is some more info:
The SQL setup rule checks for the guid of installed SharePoint. We have two guids that correspond to the SharePoint Server Enterprise Edition SKU. If the guid in the registry doesn’t match one of our guids and a farm is configured and the bits for SharePoint exists then the rule is triggered.