Hello,
I think it is a great time to make a backup of your current data, and then rebuild the system from scratch. Yes, moving everything to the Applications folder was a bad idea -- I amazed that the thing even started up for you. While you might be able to manually place everything back where it belongs, you will still have a "ghost" lingering about the next time you try to install something, and you get weird errors.
Computers are supposed to be fun -- and you went off on a creative expidition. But it is time to come back to the trail, and clean up the mud. Save yourself the grief of problems down the road by re-installing now. Personally, I'd partition the drive into two... and have your data one place, and your apps in another location.
Christian
kc0arf
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