10.4.11 problem - total Desktop reset; all preferences gone - Help!

hey there everyone; longtime listener, firstime caller...... here's my problem:
The entire OS looks like it did when i bought the computer.
Safari's bookmarks are gone and the homepage is set back to "http://livepage.apple.com" All the music in iTunes is gone, Office 2004 isn't in the dock anymore. It looks like the OS completely reset itself.
The rub is, everything is still on the hard drive; Finder tells me so, as does the HD capacity in the "About This Mac" menu.
If I open iTunes from the Dock, the iTunes setup assistant box opens first. I can grab the Word icon from Finder to the Desktop, and double-click it. When it tries to open, a box pops open which says:
"Microsoft Word cannot load the Microsoft Office shared libraries.
The files may have been moved from their original locations. Try..... "
I bought this Mac in 11/06; it is my first ever computer, so I'm pretty green, FYI. Any help on this is GREATLY appreciated. Thanks.

Welcome to the Forums!
By any chance, did you rename your home folder (the 'house' icon)? If so, that caused your problem. See this article:
http://docs.info.apple.com/article.html?artnum=107854
And this tutorial:
http://www.thexlab.com/faqs/renamehomerecovery.html
Hope this helps...

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