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Update issues and Error 8024402F
I've just restored my Asus Eee PC and proceeded to install the available updates. This it did, until I got the above error message and the text Windows Update encountered an unknown error. As I hadn't installed anything, I restored and tried again. Same thing happened. I did notice, however, that the last update it installed was the .NET Framework 4 Client, so I uninstalled that and voila, updates were back offering me that which I had just uninstalled.
I then downloaded and installed the standalone version of .Net Framework 4, and unfortunately got the same resultant Update error message. Again, uninstalling it restored update functionality. Note that the standalone installs both Extended and Client, and they need to be uninstalled separately (Extended first, followed by Client).
Needless to say, I set that update (KB982670) as Hidden so that I don't get offered it again. It would seem that there is a serious issue with .NET Framework 4 and Windows Updates on some systems, my Asus Eee PC being one of them, because removing that program restored Update functionality.