This has started today on 01-10-2018. Running Windows 7 for about 4 years on the computer.

Windows Live mail starts normally and mails are received normally and can be opened and read. Such messages can also be moved to any desired folder.

The problem starts when a new mail is to be created or when a reply is initiated to a received message.

In both cases a pop up box appears with the following exact message:

A problem has occurred while trying to open this message.  A problem has occurred. Please try again.

In the case of a new message being created the normal new window is not opened.

I have seen that Google has many such searches so this is not a totally new error. I have followed a few threads and performed the suggested solutions .. to no avail. 

There has been 2 optional Windows updates in the last few days. I tried the updates which crashed my system .. two times. 

I reverted to a restore point which appeared to be okay .. that is until I want to write a mail.