Unreadable USB flash drive

I use a 32 GB SanDisk Cruzer flash drive for backing up and saving data from my MacBook Pro, and it is now suddenly giving a 'cannot be read on this computer' message on insertion, with the options of initialise, ignore or eject. I do not want to initialise as I will lose my data - is there any way of rescuing / retrieving the data on the flash drive? I would really appreciate some advice and help, as a lot of the saved data is the only copy I have.

Dear cjvdhx
I have tried using SanDisk RescuePRO recovery software, but it has not been able to recover my data.
One of the suggestions i got from SanDisk was to reinstall the USB Mass Storage Driver, which apparently is available at the Apple website, but I cannot find it there.
Any suggestions?
Thanks
Paresh

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