How to disable OneDrive and stop it from coming up when I use SAVE As

NikolinoDE 

I tried your Method 1: explanation below and an error message popped up that Windows could not find gpedit.msc.  Make sure you typed the correct name, and then try again.  My backstory is I can NOT find my OneDrive account anywhere, nor do I recall installing it ever.  I have an old free version of hotmail, now outlook email account.  My OneDrive is full, and I am no longer able to receive/send emails.  My regular mailbox has plenty of space.  I have searched the Settings on my computer - Apps & features - and NO OneDrive or Microsoft OneDrive anywhere.  I have searched my entire computer and found nothing!  When I log into my email account, a message pops up that my account is full and to please delete files in my OneDrive.  When I go to settings, there is no Account or Syncing & Backup option.  I have tried everything and read through every post on the community help board.  I really just want my email account back, as I feel Microsoft has been holding it hostage.  There is no reason for me to pay to upgrade my storage as that has never been an issue for me, until this OneDrive issue.  Any suggestions by you or anyone else would be greatly appreciated!!

Since I can't get any emails from my current hotmail account, please email responses to my new account at sewwht2 @ gmail dot com please.

Thanks in advance for your time and attention!