I have successfully downloaded Windows 10 and have been using Windows Live Mail 2012 for some weeks.  Out of the blue Live Mail has refused to start on several occasions - the panel with 'Live Mail Starting' comes up but eventually disappears.  I have uninstalled and installed several times and each time Live Mail works but after a day or two fails to start again.  What am I doing wrong??

[Original title: Windows Live Mail 2012 with Windows 10]