How to remove an unknown item from startup?

I have an HP printer, which automatically installed two applications at my MPB startup.
The problem is that one of them (HP EventHandler) is described as an unknown kind and therefore cannot be removed, even after I insert my password.
I've already tried to delete the another one (HP Scheduler), but it doesn't make any difference to the Event Handler.
I would appreciate any other ideas.

Uninstall and reinstall the HP software that came with the unnamed HP machine, go to HP's site, and install the latest drivers for it, and finally reinstall the latest HP update from Apple. BTW, that app exists in /Library/Printers/hp/hpio/ and there's an HP launch agent in /Library/LaunchAgents/.
iMac refurb (27-inch Mid 2011), OS X Mavericks (10.9.4), SL & ML, G4 450 MP w/Leopard, 9.2.2

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For information about the Other category in the Storage display, see this support article. If the Storage display seems to be inaccurate, try rebuilding the Spotlight index.
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Do the same in other applications, such as Aperture, that have an internal Trash feature. Then reboot. That will temporarily free up some space.
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Message was edited by: jesterwylde

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