having trouble installing itunes 7 PLEASE help!

I"m having trouble installing my itunes 7. everytime i click download, nothing happens. the page just refreshes itself. i have tried it a million times and i'm afraid to uninstall and install itunes cause i wont be able to import my 6,000 songs again---most of the cds are scratched by now 😟
PLEASE HELP ME!!!!! I'm having withdrawal!!! My list of songs to buy is severly backing up!