Windows Update has stopped offering definition update 1.193.3002.0.
@Windozers only...
Is Defs v1.193.3437.0 or higher installed now?
Have you ever run the Norton Removal Tool or the McAfee Consumer Products Removal Tool since you purchased the computer? ...since you restored the image a day or two ago?
Did you know that Defender will NOT auto-update its Definitions unless Automatic Updates is enabled & set to the default Automatic configuration?
Why are so many ppl running Windows 8.1 experiencing problems with [Defender updates?]
Norton and McAfee applications are notorious for not uninstalling (or upgrading) cleanly. The "leftovers" are the Prime Suspect in such situations.
Why are clean installs of Windows 8.1 experiencing the same problem?
Probably because the Norton or McAfee free-trialware has been installed again.
...are you running Windows 8.1? If so, are you experiencing issues with update 1.193.3002.0?
Yes. No.