For some reason, after installing and then uninstalling Windows 10, (from my Windows 7 Home Premium), I found thousands of emails in my inbox. Trying to delete them in groups I frequently (not in every case) get 'An unknown error has occured' message.  I can't delete the selected email (or group of emails) unless I scroll to one that does delete. Then I go back and the original one will delete. I can't drag to 'Drafts' and delete from there and I can't repair the program in the Control Panel since Windows Live Mail isn't listed, even though I have it.

Any suggestions to help me to avoid going through each one of the thousands individually and trying each one until I can get it to delete?