Editing/Viewing Excel documents in SharePoint2010

Ok ok yes this sounds like a stupid blog post and really it is. Poor SharePoint2010 gets slightly confused, if you upload an excel document and try to open it, the system tries to open it within the browser but it doesn't seem to do anything other than error (this only seems to happen in a non Internet Explorer browser btw):

As stated above internet explorer doesn't bring up the error it makes you download it by default. We're needing to force it to download. 

This'll allow you to save the file to your local machine which you'll then be able to view/edit/re-upload.