Error code = 20008017

I just finished downloading the update for PlayOnline and everything was going as per usual. PlayOnline closes and begins to reboot but then I get a window pop-up that says:

Error code = 20008017
Cannot move version update files.

I click ok, as that is the only option and then PlayOnline shuts down. I've tried again and again but this same problem just keeps happening. I really have no idea what this means but I get the feeling I'm going to have to go into the game files and actually move some stuff around. Any ideas?

It's God telling you that it's not too late to free yourself from Final Fantasy XI!

I tried that once a couple months ago. It didn't work. D=

Edit: I've sent in an email to Square Enix about this, but I don't expect a reply any time soon.

Edit: Omecle, being the genius he is, suggested to reboot my computer. That worked. I feel stupid now.

Maybe uninstall/reinstall PlayOnline and try updating again?