WLM error code ‘0x800c0155. 997’

Already for quite some time I am experiencing problems with Windows Live Mail:

• Some emails can’t be deleted and can’t be opened anymore.
• Some emails can’t be opened and the notification ‘A problem has occurred while trying to open this message’ appears.
• In some subdirectories in my archive in WLM appeared one and the same email when opening the different emails in that subdirectory. So the emails could be opened, but a wrong, different email appeared.

I understood from a thread about this in the Microsoft forum that defragmentation of  WLM through a command as administrator. I did this, and since then WLM does not start anymore. Instead, a message with error code '0x800c0155. 997' appears.

I read in the same forum that starting in the ‘clean boot’-mode might help here. If I follow all instructions, the system configuration gets stuck and does not respond anymore. What can I do? I am using Windows 10.