I am unable to set WORD 2016 as my default app, i tried all the solutions i came accross but could not do it, clarify and resolve it kindly

Since installing your software I am now unable to receive email via MS Outlook -

MS Excel does not open on click, need to go to File Open. When received as an email attachment, MS Excel only opens a blank grey screen. Can only open after saving attachment then doing a File Open.
Tried the DDE thinh and your software said it had made the necessary changes to allow MSExcel files to be opened by clicking on them rather than using File Open

Если раньше после установки новой версии переставал работать скайп, то сейчас и Outlook перестал работать....
Скайп не делает звонки
А Outlook не грузится вообще....
А вроде бы раньше неплохая программа была....

Hello, and Merry Christmas. My gmail in windows10 will receive mail, but will no longer send. I've tried deleting and re-installing trhe account several times. Any ideas? I have no problem using the Gmail website, but I like the Windows10 default mail.
I wish you rain, and lots of rain!
George