I turned on my Vista64 PC today to find that Defender has decided to stop working!
It pops up a message with error number 0x800106ba.
A search of the knowledgebase advises removing Defender and re-installing with Run>appwiz.cpl but when I do this "Defender" isn't in the list of installed programs.
It isn't in the "Turn Windows features on or off" section either.
Running the WindowsDefender installer package just says it's already installed and doesn't offer Repair/Uninstall options.
Starting the Defender service through "Computer Management" fails and produces an 0x80092003 error which is an error relating to reading or writing to a file.
I feel this problem has been introduced by an Automatic Update as nothing else has changed since yesterday.
Anyone else having this problem?