Win 7 Home. Update hasn't run in 2 years. When try, get message that the Update Service isn't started. Checked services: it is. Windows Help site has "Fix it for me." Didn't. Tried manual steps on the site: at the first step, netstart bits or something like that - this is from memory. Got "System 5" error.
Oh yes, when I try to stop the Update service I get a message about insufficient privileges and to call the administrator. the account is an admin acct though.