Hi again guys

I had a look at my own vista update history and noticed the following:

KB941649 appears to be part of Service Pack 1 Beta Build 6001.17042

I also had update failures between uninstalling this version (17042) and installing Service Pack 1 RC1 Build 6001.17128. They were KB905886, KB941644, KB943302, KB941568 and KB941569. However after build 6001.17128 was installed windows update was reporting no missing updates.
I have since uninstalled build 6001.17128 and installed the RTM version without any further update failures.

Hope this helps