Missing playlist windows/mac

Hello,
i recently used rekordbox on mac and windows with the same usb sticks, everything was fine untill i switched windows 7 to windows 8.

I had to delete all collection on my hdd, but i had a 1/1 copy on mac from my usb stick.

Now when i connect usb to windows with rekordbox 3 or 4 i cant see the playlists, histories, etc. I have files in collection, but no playlists. Same stick on mac works perfectly fine.

What can i do?

Another question: is there a chance to move whole collection from usb stick to hdd?