Windows live mail became non-functional

Followed this thread.  Program stopped working properly after installing windows 10 and then deleting it, returning to windows 7.  Following instructions here I tried first repairing it: failed to changed problem.  Then tried uninstalling, downloading and re-installing.  Problem is worse: uploaded 3500 email titles, can't open any.  Unless someone has another solution I will be forced to delete it permanently and revert to outlook.