AutoCAD Mechanical 2012, Win 7 x64, office 2007. User can not create data link. Message says Cannot create Data Link check the Excel install. Others use same dwg file can create. Others user same spreadsheet can create. Have re-installed AutoCAD and re-installed office. Its like it doesn't even know what excel is. I am able to cut and paste a picture of the spreadsheet into the drawing file. Know this works and have used many times on this machine until a few days ago.