I had this yesterday, it was 3 x Critical Updates for Net Framework. Auto updates just kept looping through download and installs.
I let this happen 3 times before disabling autoupdates, renaming the SoftwareDistribution folder in C:/Windows and manually attempting the update.
If memory serves, the manual update still failed/looped but I am no longer plagued with the update notification.
The usual fix for this issue is to roll back to a date before the update notification, I couldn't attempt that as this is a server based network PC with no roll back facility.
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