Renamed Volume Group name on Webmin while running samba server (oops)

Hi...I'm new to Linux and was working on a home server. I have it operational with Samba Share as my NAS system. Unfortunately, while I was on Webmin I changed the Logical Volume Group Name and now I can't find the data I had saved on my Samba Server.

Can anyone help me recover those files?

thanks much,

Lester