Windows Update

Hallo,

Since the last update in September, suddenly problem with Windows-Update:

Operating System WIN7/SP1

In Oktober no Updates received, tried to search for Updates > the search goes on for several hours without any result, also after many computer new starts> no error code and no message.
The Windows-Update agent File wuaueng.dll is Version 7.6.7601.19161 from Feb 2016 (therefore the current version)

Also tried Microsoft Easy-Fix Diagnosis Diagnose Cabinet which also did not solve the endless search problem.

Have also not installed any new Hardware or Software!

How do I fix this?