I have Windows 7 and up until now have been able to open attached files (.pdf, .doc etc) by double clicking on them in windows Live Mail. As of today I can not. I downloaded the latest version of Reader, cleared my history, temp files, Favorites website data,  in Internet explorer. I have checked to insure the extension is linked with the .exe program. When I right click on the data the "Open" choice appears but not the "Open With" choice. When I choose open or print, nothing happens. I can however select save and then open the file in the saved folder.