Monday, August 9, 2010

One registry key and what a mess it does to Windows!

In my network I have several computers and servers, most Windows (XP SP3 and Win7). About two months ago I started noticing strange behaviour across some PC and 1 server.

Symptoms
1. Windows Update Service stopped downloading updates.
2. McAfee Total Protection SaaS client stopped downloading updates with an error message: Component's digital signature cannot be verified.
3. Windows Update stopped working complaining about digital signatures with error code 80092026

Resolution
After some digging on the Internet I found only a few indication of the problem. And one of them was correct: http://blog.stealthpuppy.com/windows/windows-update-80092026-plus-certificate-crypto-operation-failed

Looking at the registry entry (HLM\Software\Policies\Microsoft\SystemCertificates\TrustedPublishers)I discovered one particular key that was present only on systems experiencing problems.

The problem has gone away as I deleted the key. The systems are working fine now.

I hope this helps someone.

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