Some software I installed was not working properly and the developer asked me to check the EVERYONE permissions under HKEY_CURRENT_USER\SOFTWARE\NameOfHisSoftware. Much to my surprise there the EVERYONE group was missing. I tried creating a new EVERYONE group but it didn't solve the problem nor did I think it would.
I don't recall deleting it, so could it have been an issue created during the install? The Windows 10 OS install was simple and straight forward, based on the most current ISO Windows had to offer.
Thanks,
phil