I have Microsoft Excel 2007 and am trying to open and edit a document from my Employer's SharePoint (I am not sure what version of SharePoint they are running, unfortunately). I have attempted to open the document by logging in to SharePoint on the latest versions of IE, Firefox, and Chrome, but all give me the same errors.

If I attempt to open the document directly, it tries for a moment then I get the following error message:

> 
> The workbook cannot be opened because it contains the following
>  features that are not supported by Excel in the browser: 
> 
> 
> • Data validation Would you like to try and open this file in Excel?
> 
> 
> 

If I use the drop-down on the right and click the "Open in Microsoft Excel" button, I get this error message instead:

> 
> The document could not be opened for editing. A Microsoft SharePoint
>  Foundation compatible application could not be found to edit the
>  document.
> 
> 
> 

I have been able to access the document on other systems (which, of course, I don't have access to now), so I know the problem most likely stems from my current access point (though not the web browsers, apparently, since the errors are uniform across several), but beyond that I can't seem to drum up any actual solutions. Any suggestions?