I am unable to send or receive emails from Windows Live after upgrading Windows 10 as you said I needed to do

Where is this “my post”? If you are going to refer to a particular post please provide a link. I was having NO problem with WLM until a recent Windows 10 update. A dangerous “solution” I just tried posted here only created MORE damage and now I can not access WLM at all. Is this the post you refer to?

https://answers.microsoft.com/en-us/windowslive/forum/livemail-program/windows-live-mail-a-problem-occurred-while-trying/21387c73-4d32-4765-9c67-6078e4798d7f

I did a restore point first and rolled back and that did not correct the problem created by the “solution”. Now I can do ANYTHING and restore did not help. Not it’s only a worse disaster

Please define your terms! "create DWORD entries" What on earth is a DWORD entry?

If you follow through my proposed fix in all its steps, you will not have to ask this, because the answer will be obvious.

A DWORD entry is one option, part way through the procedure. When you get to that step, you will select the option labelled DWORD in the registry editor program.

I have the same problem but I can not be due to Windows 10 Update 2004 since I have been using Win 10 just fine through 2020 and it is is only a recent update in February 2021 that caused the problem.  I can receive email but not send or forward: "an error has prevented this file from opening". This happened only after Win 10 MS TECH support "fixed" a prior problem. Most suggested solutions are responses to older questions not exactly the same.