Are there any drivers
for 64 bit vista -- they *Might* work.
This might be a bit of a pain but you'd certainly get some learning experience.
If this stuff works on Windows 7 32 Bit why not install Windows 7 32 bit as a Virtual machine and run it from that - VBOX is FREE as is VMware player (i'd use this one).
You'll get some decent experience, it won't take long and is very instructive.
If Windows 7 32 bit doesn't support the scanner load up an XP VM instead (BTW NOT XP MODE that's a different facility and it won't run on Windows 7 Home Premium anyway).
Don't throw away perfectly good hardware just because you can't find a driver
for the current OS. Virtual machines are incredibly useful for this type of stuff.
(seems strange that there's still stuff out there even for Windows 98 but no 64 bit stuff for a relatively modern device -- this is why I would go for the VM option -- there's enough Corporate Greed on this planet already -- don't fall in to the trap of junking perfectly good bits of kit just because the Manufacturer is looking to consumers as milch cows to upgrade every few months to improve the Share prices and boot the CEO's earnings).