Since there was the discrepancy in Product ID numbers reported by some, I downloaded and installed another copy of Windows Defender today. (It was dated October 25) I had uninstalled the earlier version previously.
FWIW--here is what is now reported "About Windows Defender"
Windows Defender Version: 1.1.1592.0
Engine Version: 1.1.1609.0
Definition Version: 1.14.1736.7
Product ID: 81664-844-2923435-04065
The numbers are moving fast. It is hard to tell which number shows a later version. 
Jim
WIN7 Ultimate SP1 64bit, IE 11, NTFS,
cable, MS Security Essentials, Windows 7 firewall
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