I am very happy with Windows 7 and with Windows live mail. However, recently on rare occasions when I have tried to open Windows live mail, it starts up greyed over and with a message that it has stopped working, and Windows is looking for a solution. Immediately after that it will open as normal again. This only happens rarely. I believe that I have found a solution.
C/Program files/Windows live/Installer. Double click on wlarp, and select REPAIR. Everything has been fine since I did this a couple of weeks ago.