Some months ago, I removed Parallels Access from automatic startup and from the menu bar, and thought it had completely gone away. Now, having just upgraded from Mountain Lion to Mavericks 10.9.2, I find that a piece of it has reappeared zombie-like and I would like to get rid of it. At startup time, a dialogue appears from Parallels Desktop Control Agent, asking to be granted control of my computer. It wants me to enable this in the Accessibility section of the Privacy tab of the Security & Privacy preference pane. Whether I enable it or not, I see the Parallels Access Control Agent running in Activity Monitor, and unless I do enable it, I get the same request at every startup. I don't understand why this has only begun after upgrading to Mavericks, but I would very much like to rid myself of this nuisance.