I've done the same thing to mine and I can't fix it.
The new, empty user account has the house icon. The old account (that I'm trying to revert to) has the grey Network orb icon with a shortcut arrow. I can rename the new account ok but the old one won't let me. I've included the info here...
I've got a 1.5 Ghz 15" PowerPC PowerBookG4 with 512 MB DDR SDRAM Running Mac OS X 10.4.11.
I just deleted all of the duplicate music files from my iTunes folder. I'm using FileVault so I restarted after deleting stuff to get the space back. It took about 40 minutes to restart and came back...