At-spi-registryd, if I am not mistaken, is only needed if you use a screen reader or assistance applications of some sort. If none of the machine's users need such things, you should simply disable it - search your settings menu for something along the lines of Accessibility/Assistance. Failing that, you should look if there is such entry or any application that might use it, such as Orca screen reader among your Startup Applications.
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