Ranger versions later than 2.2.78 are tested to be Vista compiant.
Most earlier versions should work with Vista, but with some limitations because of the security changes in Vista. Namely, Ranger Logs may not be produced.
These scanners have been tested as Vista compliant:
RDM EC7000i
Magtek MICRImage
Panini MVX
Pertech 6100TS
DigitalCheck TS Series
Canon CR-180/CR-25/CR-55
Kodak i60x0/i6015
Magtek Excella
Epson CaptureOne
Epson J9000 Series