repairing Live Mail

I am running windows7 with live mail. I think some files may have been lost or deleted as I have developed a number of problems such as not all mail boxes will download and those that do won't open pictures and buttons. I would like to try to repair it so that I don't lose everything, but when I go through the file list to C:\Program Files\Windows Live\Installer , or try it through the control panel, Uninstall a Program. and so on, the box that opens does not have a repair option..... only uninstall. Any other ideas on how to try to repair the program ?