Hello Dave,
Thank you for the response. When I updated windows 10, my desktop files disappeared. I also, lost my thunderbirds email account setting (no email account was left on my thunderbirds), as well as most of the shortcuts on the desktop and even my windows languages that I added long time ago. I looked for my desktop files and I found them in my user folder in drive C. what i did, was to move all my desktop files and moved them to a safer place (drive D). I set up my emails on thunderbirds again, added the languages again, created new shortcuts for word, excel, etc. After two weeks, the window10 was updated and the same thing happened once I again (desktop files disappeared, thunderbird emails was gone plus the windows languages. But this time I didn't find the missing file in the user folder in drive C like the previous time. To cut this short, the same thing happened with me may be 5 times till now (when I get windows10 update). This has been very frustrating, I am so very disappointed about Microsoft windows.
I don't know what to do to fix this issue!!!