this is pretty ancient model, but... you can try to use winxp twain driver and it should work, your registry most probably will need bit of tweaking... version which will most probably work is
TWAIN Driver v5.53A,
follow this procedure, disconnect your scanner from computer, run ccleaner to clean all rubbish, including registry clean.
download twain driver and then run it, force vista to accept it, reboot your computer. connect scanner and you will have then warning from vista about digital signature, disregard it and force install software. scanner should work.
i still would suggest newer version...