Can't access my files on Sandisk Cruzer Removable Disk 4gb vault

I don’t know what happened, but all of a sudden the Secure access  instead of asking me for a password, it takes me to the set up my vault window. Before, I would normally enter my password and have access to my files. But now it tells me to make a new vault!!! I haven’t done anything to the USB flash drive, besides transferring some files to my other computer. I haven’t created the new vault, cause I am afraid that might reset everything and delete the dmbackup.dll file which I suppose holds the files I stored in the vault. HELP PLEEASE!! 

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