Windows update fails (and a service fails to start)

Someone came to me with a computer that was not able to run Windows Update. It could not even check for new updates. Also, upon booting, the system would get an error notification: “Windows could not connect to the System Event Notification Service service.”
I had to go to the System Event Log and clear the log (I received a “corrupted” error when trying to view it.)
After that I tried windows update and got the same error. But now in the system event log I saw a “file not found” error for TrustedInstaller.

The following fix from Darrell Gorter (his second post regarding how to replace TrustedInstaller.exe) worked:
http://social.technet.microsoft.com/Forums/en-US/itprovistasetup/thread/4e9b31de-5628-4083-9e3a-cd9e0d1aeeac/
After following his instructions I found the latest copy of TrustedInstaller.exe and was able to move it into C:\windows\servicing\

May also be important to note that this computer was also using Avast! which is mentioned in the post.

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