I think I may have only booted into xp once on accident since I have had it set up.
If everything was in twice then It wouldn't be a big deal..
But its in there at least 10 times per movie title.
It just struck me as odd.
You have a loop there somewhere... like some other type of upnp device on your LAN that also has a list of files and LMCE is finding them again and again.
Have you gone through the web admin ->Files & Media > Files and Media Sync?
Navigate down the left column, and on the right, check the box "Show files who are missing from disk"
Looking around in there has helped me clean things up.But be careful if you delete anything!!!
What I've found is you have to click on the filename in the right window and then click on the delete button in there. If you click delete on the previous screen it wipes out your entire database and you have to wait for it to recatalog and then you get to redo some of your attributes.