Gnutella Forums - I'm am angry beyond all belief... Please Help Me!!

Ok... I have been useing Limewire for the past 6 months or so and I have to say its the best thing I've ever used. Before today I had been useing I think it was 4.14 or somthing like that. I havent had any problems until now... Not even 10 minutes ago I opened up Limewire 4.14(?) and somthing popped up saying I need to upgrade to Limewire 4.16.6 and I was just like "Ok, what ever". After It downloaded i was pleased with then new look but when i hit the "library" tab I almost crapped myself. I had 900+ songs and now their all gone!!!! I have no idea what to do, I'm thinking they have to be saved on my pc somewhere??? So any help would be AWESOME and if i can get my music back I will be so releaved. If there is nothing that can be done... well... I will explode... Thank you in advance-Zach