If you are using Windows Live mail for retrieving your email sometime it happens that you lost you installation in this way you lost your Windows Live mail too so in order to retrieve it back do the below steps.

Before formating your previous installation you have to take backup of the below folder.

C:\Documents and Settings\[USERName]\Local Settings\Application Data\Microsoft\Windows Live Mail

After the fresh installation, install Windows Live and open the Windows Live Mail once so that the folder got created then replace your backed up folder with the newly created one on the same path.