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Windows Update dependencies corruption is the most severe problem of all three.In this case, you might try using the Microsoft Update Catalog to launch the needed updates by hand. Some users encountered situations when security updates (Windows Defender update in particular) could not be executed for some reason, while other types of updates carried through just fine. That would result in some updates successfully carried out and some stalling. Windows Update might also be fragmentarily corrupt.If you are dealing with the corruption of one or some WU components, the most advisable thing is to launch Windows Update Troubleshooter and follow its instructions. Windows Update (WU) component failure.Windows Defender Fails to Update: Probable Causes

Attempt 3: Reinstalling Windows (In-Place Repair).Attempt 2: Installing Missing Updates by Hand.Attempt 1: Windows Update Troubleshooter.