Windows 10: I am having trouble changing my save location

I cannot change where my new content is saved, whenever i click on the D option it will tell me i have a duplicate on the C drive and that it has to delete it so i clicked yes and i keep getting this error code right after "0x80070005"

:)

 

I am having trouble saving a file to my desk top.

I am having trouble saving files to my desk top. Example, I have a spreadsheet ready, file , save as and Desk top is not listed as a choice to save it. My Documents... not there. Where do I go to save the file to my desk top? Desk top is not in my Documents

 

Trouble saving voicemail number

To access my voicemail it is my phone number, a pause and 4 digit pin.



I did the following steps:

• Turned off default voicemail number
• Added a , (for pause) at end of my phone number
• Added the 4 digit pin

I get the following error message We're having trouble saving your voicemail number right now. Try again later.



Any suggestions on how to correct this?

 

Recent (Save Files) - Change Default Settings to OneDrive

Hello -
Thanks for the return. Before I undertake changing the Registry, I have a question.
The steps in my Registry, for my version of Windows 10, were a bit different, but I think I eventually got to the right spot.
The last step is to change the number of places you want to list in Recent Places. In my case, the default Max Display listed 50 as the number. So, if I were to change that number, how do I know the Save As page will be one of those places? Or, a similar question, will this registry change delete the tab Recent from my Save As page? This is what I would like to happen.
When I received my computer in Nov. 2016, the Recent tab was not listed in the Save As page. Something caused it to be added over time. Which brings me to this second question. Would there be any benefit in deleting the changed registry listing and reverting back to the default listing? See attachment.
Jerry