User had this error exactly as per the Windows 10 discussion (Windows 10 Update 15 June 2016) except that they are on Windows 7 Pro.
SAP was working fine the previous night. As everything else looked OK, looked at Windows Updates that had recently been installed. There was only one and it was labelled KB3161608 installed that morning. Removed this update and rebooted. SAP Can now be logged into again.
As this is fairly recent, was wondering if anyone else may be getting this problem?