Something went wrong with my drive, help please

hi all.

a few days ago my my book live where missing from my computer, i tried different things and made it visible again, but when i open the drive i can see files, but not like they where before.
i use a sonos that playes music from that drive, and it can acces all the songs, but i cant from my computer. before when all worked it had a different name in my computer, now its this:
Public (MYBOOKLIVE (My Book Live Network Storage))
before it was something with z as drive letter i think.

are there anything i can do about it, without loosing everything on the drive