I couldn't start up my computer, so I reinstalled my software using the install disk that came with the computer. I did the archive and install so I could keep all my stuff, and I even backed everything up in case something went wrong. Well, something seems to have gone wrong. I'm back to OS 10.5.1, while I was on the latest version just yesterday. It says it can't open iTunes Library because it was created by a newer version of iTunes, and other annoying problems that comes with having an old OS. I had to clear a bunch of space to do the update in the first place, and now I don't have enough room to update my software (It requires 6ish GB, I have 2ish). Finally, even though I have everything backed up on Time Machine and could easily just revert to what I backed up yesterday, my computer doesn't seem to know what Time Machine is anymore. Does anyone know of any quick fixes that don't involve clearing a ton of space in my HD?