Windows Live Mail Not Working Properly

I have 4 email accounts loaded in my Windows Live Mail program - 3 with Time Warner and 1 with my web site host.  (Computer running on Windows 7)  A few weeks ago I began not being able to delete emails on my account with my web site host.  When I select an email message and try to delete it, a message box pops up that says "An unknown error has occurred."  

Yesterday I became unable to send or receive emails from any of the 4 accounts.  When I click on the inboxes of the accounts, select an email message to read, or try to delete an email message, the "unknown error" message box pops up. 

I searched the Internet and tried a couple things.  One was that I opened up Command Prompt under my Programs >Accessories folder and typed in the text at the prompt to scan and repair Windows files.  I tried this 2x and both times it stopped after reaching 42% progress.

Today I restarted my computer and opened Windows Live Mail.  New messages came in but after that I could not send or receive emails and received the following error message for the 3 Time Warner accounts:

Unable to send or receive messages for the Stny.rr (xxxxxxxx) account. An unknown error has occurred.

Server: 'pop-server.stny.rr.com'
Windows Live Mail Error ID: 0x800C0160
Protocol: POP3
Port: 110
Secure(SSL): No

On all 4 email accounts, the checkbox is check for Outgoing Mail: The server requires authentication.

I don't want to have to upgrade to Windows 10 if I don't have to because of possible compatibility issues with software I have on my computer.

Any ideas on how to resolve my email problems?