WLM gone squirrely

After a happy life in Win 7 I took the plunge to Win 10. After a couple of days I reverted back to Win 7-phew!
Since coming back my Live Mail is doing strange things. Every time I open WLM another windows opens stating 'Restoring Live Mail database'. After that it appears to be OK but some (many) email messages in Inbox will not delete. I get a message ' An unknown problem has occurred' If windows doesn't know what the problem is how am I supposed to know. I have run the repair tool but no luck. I actually deleted live Mail from Windows Essential and reloaded it but it started reloading the Data base routine and brought all my messages back into the new install. Now I have hundreds of message in my Inbox that I can't remove and the unknown problem message keep popping up. I'm not a pc expert but I'm not dumb newbe either and this is driving me to distraction as my wife wants my old pc and I can't clean it out. Suggestions please

Thanks for the quick response ICITLOL-good one! I didn't do anything to prepare the HD to revert to WIN 7. On Microsoft site there is a link to reverse the 10 install and I clicked on it and it did the rest

Thanks for info. It would appear that your expertise is light years ahead of me. As a retired exec I read a lot of computer reports but really only started the 'hands on' part 10 years ago. Here's where I'm at. I'm not going to reload Win 10. I started on XP and graduated to Win 7 and missed all the Vista debacle so Win 7 is a comfortable place to be. What I want to do is get this laptop cleaned up so it works properly. I want to do this myself (with your help) so it adds to my learning curve. I ran Disk Clean up but that didn't make any difference. I am going to review DISKPART and try to understand what it does. What I don't want to do is erase any data in the pc now. So while you're sending out ZZZZZZ's in the land downunder I'll try to get up to speed and not screw things up. Cheers

Perhaps a reinstall of Windows Essentials will do the trick!
Just open "Programs and Features" and click "Windows Essentials" then the uninstall button! Once you've uninstalled the program, I would restart the computer for good measure (although it probably isn't necessary), then redownload Windows Essentials from Windows Essentials - Microsoft Windows. (it's free!)