While my installation of Windows 10 went flawlessly from Windows 8 I did encounter one problem today which would only cause issues for a small number of users. I have two hard drives (well, one hard drive that is partitioned to look like two). Drive C: and Drive D: I use drive D: to keep all my documents, OneDrive,pictures, etc. and my C: drive is just for programs. When I went to save something to my D: drive I was given an error message that I did not have permission to save anything to that drive. Yikes! I suppose something changed during the upgrade that caused the D drive to be off limits. After looking around and experimenting with a few things I found that it was a problem with how Windows gives permission for access to certain folders.

Basically I needed to remove all the Inherited rules for the Administrator and then add the Administrator back in with full access. This is all very difficult to explain but I did find a helpful YouTube video (see below) that explains it. Really it's only the first half of the video that need to watch in order to fix the problem.

This is all rather confusing, especially if you aren't familiar with how this all works but at least if you encounter the same problem I hope this helps.