Endless loop of LoginWindow crashing.

I was following this guide: http://www.simplehelp.net/2007/11/27/how-t...y-itunes-style/ and got step 2 done then noticed that my Hide/Show hidden files plugin wasnt working so i rebooted. Now when i boot up i get to the point where my wallpaper and the dock show up, then a seconds later i get the beach ball for a few seconds, then it kicks me back to the baby blue screen and starts the process over again. I booted with "-x -v" and it says something about the login window crashing.
In single-user mode i ran 'fsck -f' and it didnt help. I also cleaned out the launchservices caches and it didnt do anything.
Please tell me i can fix this!
Thanks!

 

i feel dumb
I assumed the backup was made with a copy command, but it was just moved so the original wasnt there anymore. I renamed it and now it works fine. Thanks!