CORRUPTED 16GB KINGSTON USB FLASH DRIVE!!!

Hello,

I AM IN DESPRITE NEED OF HELP ,,, OK SO, I'VE HAD MY KINGSTON DATA TRAVELLER 16GB FOR ABOUT 9 MONTHS, I'VE HAD ABOUT 20 FOLDERS OF PICTURES, AND SOME SONGS. I HAVENT TOUCHED IT SINCE I BOUGHT IT. ON APRIL 24TH 2011, I RECENTLY ADDED A FEW MORE FOLDERS AND DOCUMENTS TO THE USB FLASH DRIVE, AND I MADE SURE EVERYTHING WAS LOADED ONTO THE USB FLASH DRIVE ON MY WINDOWS 7 COMPUTER (I TESTED IT ON 3 COMPUTERS AND IT WAS FINE) ...SO I BOUGHT A MACBOOK APRIL 27TH 2011... TRIED TO LOAD ALL MY FOLDERS ONTO MY MACBOOK AND NOTHING WOULD READ AT ALL! I AM SOO UPSET... EVERY TIME I ATTACH MY USB NOW, IT SHOWS THE TITLE OF THE USB ALONG WITH THE TITLES OF ALL OF THE FOLDERS AND WHAT NOT, BUT WHEN I TRY TO OPEN SOMETHING IT FREEZES OR IT JUST SAYS " THIS FOLDER IS EMPTY" .... Someone pleaseeeee help, these files are very important for both me and my boyfriend, if anyone knows a great program to fix it guarenteed without spending $500-$1,400 to fix a corrupted USB FLASH DRIVE or a FLASH DRIVE WITH A VIRUS OR DEFECT, id really appreciate it alot.