First of all - welcome to BC !
I would be inclined to a Windows restore to a date before this problem started, you should have a suitable restore point since this only started a few days ago.
Click 'Win key + X - Control panel - Recovery - Open System Restore'. This will take you to a screen listing the most recent restore point(s). If there isn't one listed from before the date this problem started then click the button 'More restore points'. Then start the restore process. Accept the warnings about this being irreversible and let it do it, it may take 10 minutes or so - do NOT interrupt the process. When it is finished you will get a message either 'Successful' or 'Failed - no changes were made'
If it worked, try Win Explorer again. You may need to re-install any updates between the date of your restore point and now. I suggest doing them one at a time and testing Win Explorer after each one since it is possible an update caused this problem.
If the restore didn't work, then uninstall any recent updates one at a time and test again.
NOTE - A restore should not have any effect on your installed programs and data, but it is a good idea to back up your data before starting.
Edited by Chris Cosgrove, 14 November 2015 - 06:34 PM.