Error: either scanner driver is not installed or scanner is not connected

Acrobat 11 standard on Windows 7 Pro x64 worked great for years with a Brother MFC scanner on a small office network connected via ethernet cable.  All of sudden, Acrobate will no longer detect this scanner.  However, I can use photoshop to connect to the scanner.  I use Acrobate to scan documents to pdf and this issue is really annoying.  Please help.

I have tried the following with no success:

• Uninstall Brother software and Acrobat and reinstall and update.
• Check for any driver updates
• Manually search for any drivers or folders with Twain and delete them.  I then re-installed the most current Brother drivers.
• Tried selecting "Custom Scan" to see if I can select a different scanner or un-hide any scanners.  There is no "hide" option in the custom scan box of Acrobat Standard 11.