I have an Epson 1640SU. I acquire some years ago by a few hundred Euros. It is in excellent condition. When I bought was using Windows XP. The software + drivers were then downloaded from Epson's website, for free. After that I upgrading to Vista Ultimate. Software + rivers can be downloaded from the Epson website, but it costs $ 30. OK, I'll pay. At the moment, I upgraded toward Windows 7 Ultimate. The software + drivers are not being supply through Epson. They recommend that customers with the 1640SU scanner utilize VueScan.