Acer (BenQ) does not post drivers according to the model number found on the label on the rear of the scanner. They post them according to the label name found on the top lid of the scanner. ie: 640p, 610P, 620U, 610S, 4300U, 320U, S2W3300U, etc.
This is what the rear label looks like: (on a model
S2W 3300U)
This is what the top label (on the lid cover) looks like:
BenQ has not (and never will) write drivers for Windows 7. The scanner technology does not allow a parallel port scanner to work in Windows 7.
If you care to try the fix for Windows XP (perhaps it will work in Windows 7), then try this: (but there is no known fix for using parallel port scanners in Windows 7)
How to install Acer/BenQ parallel port scanners in Windows XP
http://forums.driverguide.com/showthread.php?t=17300
or
http://forums.driverguide.com/showthread.php?t=43398
or
http://forums.driverguide.com/showthread.php?t=42168
or
http://forums.driverguide.com/showthread.php?t=41622
or
http://forums.driverguide.com/showthread.php?t=21560
or
http://forums.driverguide.com/showthread.php?t=35623
or
http://forums.driverguide.com/showthread.php?t=32417
or
http://forums.driverguide.com/showthread.php?t=24267
or
http://forums.driverguide.com/showthread.php?t=23463
or
http://forums.driverguide.com/showthread.php?t=18401
or
http://forums.driverguide.com/showthread.php?t=30505
or
http://forums.driverguide.com/showthread.php?t=28871
or
http://forums.driverguide.com/showthread.php?t=28110