Wishmaster - The temp files were not moved using a registry hack. It was the environment variables, as I stated.
CarlTR6 - I did not keep track of it, but did not add any keys. I based it on a google search, changed the default installer's location under three sections in HKEY_LOCAL_MACHINE/software/windows.
As for the others: I really don't mind experimenting like this with the registry. I have three computers, all of which are entirely functional, so if one fails, I have two others to use temporarily. And it did need to be fixed, because the best-of-the-best backup software costs $$$ and every time I reinstall Windows I lose application settings, game save data, OS settings, updates, programs. If I have them on a separate partition, I at least know/have what needs to be restored. It's summer time, can't find work, and no school, so I didn't really mind taking a little risk and play around to see what I can do, after all; that's how people learn.