First run a Check Disk in windows to make sure that there hasn't been any file corruptions. I have a password protected file on my computer that I couldn't access once because it claimed that the password was wrong. A Check Disk solved the problem. I have in mind a "proper" Check Disk which will require a reboot. For Windows 10: Click on the Cortana search button on your task bar, just right of the Start button (see first snip below), type cmd in the search box, but don't press Enter. Above that, right click on Command Prompt and choose Run as administrator. User Account Control will ask if you are sure you want to run it. Click Yes. Then you will see a window similar to my second snip. In that you type: chkdsk c: /f It will then ask you the same question as you see in my snip. Type "y", then the Enter key. Then close that command prompt window, and tell Windows to restart. It will do the disk check before Windows fully starts. Let it.