File Explorer not opening

Question

Receive this error when opening explorer in SharePoint 2013 library:
We're having a problem opening this location in File Explorer. Add this web site to your Trusted Sites list and try again.
This error happens on the Windows 8.1 client and Windows Server 2012 R2.
Using Windows 8.1 with all updates
Tried IE 11 64bit and 32 bit same result
Server is 2012 R2 datacenter with all updates
SharePoint 2013 foundation with SQL express (out of the box setup)
Web client installed and running on both Windows 8.1 and Server 2012 R2
Added the site to both server and client in the trusted site area of IE
I did installed the desktop experience on the server 2012 R2 and rebooted. I then checked to see if the webclient service was started and it was. However, I still get the same error from any Windows 8.1 box I use.
Loaded up a fresh copy of Windows 8.1 and still received the same error. Tried again from the SharePoint 2013 Foundation server and still received the same error: We're having a problem opening this location in File Explorer. Add this web site to your Trusted
Sites list and try again
Please help with any other ideas.

Answer 1

OK Everyone,
Here is the answer I came up with and it worked on the client and server both. Procedures for Office 2013 are also in there.
I don’t think “Explorer View” will work until you edit your registry to support non-ssl websites.  Not only did MS lock down Office Products, I believe it locked down the
WEBDAV protocol, which is used for “Explorer View”.   
There are two configurations you must make.
The first step will fix the Explorer View
The Second step (install SharePoint Designer first) will Fix Designer.
Step 1: Configure WebDAV Redirector on the client
To enable Basic authentication on the client computer, follow these steps:
In Windows Vista or Windows 7, click Start, type regedit in the Start Search box, and then press Enter.
In Windows 8, hold the Windows key (WINKEY) + F, highlight Apps in the Menu bar, type regedit in the Search box, and then press Enter.
Locate and then click the following registry subkey: 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
On the Edit menu, point to New, and then click DWORD Value.
Type BasicAuthLevel, and then press Enter.
Right-click BasicAuthLevel, and then click Modify.
In the Value data box, type 2, and then click OK.
Note The mapping is as follows: 
0 - Basic authentication disabled 
1 - Basic authentication enabled for SSL connections only 
2 - Basic authentication enabled for SSL and non-SSL connections
Exit Registry Editor, and then restart the computer.
Step 2: Update the Registry on the client
Note This step is required for Office 2013 and Office 2010 applications.
On the client computer, add the BasicAuthLevel registry key and an appropriate value. To do this, follow these steps.
Important Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
Start Registry Editor. 
In Windows 8, hold the Windows key (WINKEY) + F, highlight Apps in the Menu bar, type regedit in the Search box, and then press Enter. If you are prompted for an administrator password or for confirmation,
type the password, or provide confirmation.
In Windows 7 or in Windows Vista, click Start, type regedit in the Start Search box, then press Enter. If you are prompted for an administrator password or for confirmation, type the password, or provide confirmation.
In Windows XP, click Start, click Run, type regedit, and then click OK.
Locate and then click one of the following registry subkeys:
For Office 2010
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\Internet
For Office 2013
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Internet
On the Edit menu, point to New, and then click DWORD Value.
Type BasicAuthLevel, and then press Enter.
Right-click BasicAuthLevel, and then click Modify.
In the Value data box, type 2, and then click OK.
Note The mapping is as follows: 
0 - Basic authentication disabled 
1 - Basic authentication enabled for SSL connections only 
2 - Basic authentication enabled for SSL and for non-SSL connections
Exit Registry Editor, and then restart the computer.