How can you tell iTunes 7 to ignore other music folders causing duplicates

Question

I just built a new PC and my iTunes library is on a 250 gig disk along with many other folders with music (drum loops, systems sounds, sample content, etc) that I don't want showing up in my iTunes library. Many of the folders contain backups of various thumb drives so there are identical songs in multiple directories showing up as duplicates in iTunes.
Preferences shows my library in a single location.... anyone know how to restrict iTunes to only using this location ? I don't remember hitting an "import my entire hard disk" button, but I may have. I can rip out and re-install if needed, but I don't want iTunes to remember all thge other folders outside of it's home directory... did i miss something really simple ?
Help ! I have about 1000 duplicate songs, some with 3 or 4 copies that reside in the portable media backup directories !

Answer 1

To do this, in iTunes go to Edit>Preferences>Advanced Tab>General Tab and then uncheck the "Keep iTunes Music Folder Organized" box.
That has nothing to do with iTunes looking for music on your computer.
Keep iTunes music folder organized will create a folder hierarchy of artist and album names that contains all relevant audio files with the correct track names and order.
When you run iTunes for the first time (only), it asks to search your computer for music.
After the first time, the ONLY music that will get added to iTunes is the music you add. iTunes does not add music based on what you put in folders. It does not "watch" to see if anything is added to a folder.
If you do not want music copied to the iTunes music folder when adding to library, (and you want the music in your own folders somewhere else), set it in the prefs.