iTunes problem (mac->win)

Hi,
now that i got DVS and Cross
working quite well on my netbook i wanted to copy my musiclibrary from mac to the win-netbook.
So i copied the music from my mac-itunes folder (only the music-folders) onto my external drive and over to my netbook.
My problem now is that, despite that all my tracks are organized perfectly on my mac-itunes, in Win a lot of stuff is messed up.
On mac my unknown-artist folder contains 30-40 tracks, but now on Windows there are 2000+ tracks in the unknown-artist folder, and when i look at the mp3-tags, they are empty except for the trackname.
no album- or artistname?
I dont get it
now that i got DVS and Cross

So i copied the music from my mac-itunes folder (only the music-folders) onto my external drive and over to my netbook.
My problem now is that, despite that all my tracks are organized perfectly on my mac-itunes, in Win a lot of stuff is messed up.
On mac my unknown-artist folder contains 30-40 tracks, but now on Windows there are 2000+ tracks in the unknown-artist folder, and when i look at the mp3-tags, they are empty except for the trackname.
no album- or artistname?
I dont get it
