Summary: I had purchased this many years ago. It continued to work fine on a computer I upgraded from XP, Vista, 7, and now Win 8.1. It worked until I did a clean install. I had to contact Epson Support to get the following instructions. They work for Win x86. For x64, Epson will direct you to a 3rd party. See below. Thank you for contacting Epson regarding your Epson Perfection 1640SU. I am sorry you are experiencing difficulties scanning.
Summary: I've read the reviews and they weren't very flattering on this scanner. But after careful re-readings it became apparent that most of the complaints dealt with either incompatibility with printers and/or installation of the supporting software. I've run into these problems myself in the past and slowly, but surely, have discovered that they were due mainly,on my part, by not reading the instructions thoroughly.
Summary: Be aware buyers. Epson still doesn't have windows XP driver for this scanner. There is absolutely no reason the drivers are not ready as of Feb 2002. Even the ones coming out is not certified by Microsoft. I usually like Epson printers but this scanner is totally useless with my Windows XP system.
Summary: Scanning on the Epson 1640SU initially worked well. It was very fast, and the documents looked very good on my display. However, two of the main reasons that I wanted to use a scanner were making copies of documents and faxing documents. After I started using the Epson 1640SU scanner, I found out that I could not do either function, even though they say that they can.
Summary: Perfection 1640SU is my first scanner, so i can not compare it to anything, but it works very well for me.I think that it is very good product. However, my problem is - communication with Epson technnical support. There is no simple way to resolve simple question of scanner/printer compatability, other than long-to-wait pay-phone connection.
Summary: The Epson 1640u is a great upgrade scanner from a 600x1200 dpi scanner. With the recent drop in price it costs as much as my original 600x1200 scanner. The color and detail is very good. While the scanner is slow for high resolution scans using a USB connection (though a SCSI-2 connection is also available if you buy the cable and card), it still is quicker than the 600x1200 dpi scanner it replaced for more detailed scans.
Summary: I got this scanner to replace a UMAX 1220S that I had before. The UMAX had one big problem - I couldn't turn it off. It sat on my SCSI chain and if it saw any traffic it would stay on - since I have CD-ROMs on the same chain it was on constantly! After a while being constantly turned on must have hurt something because after a while I started getting chromatic distortion on sharp edges. So it became time to replace my scanner.
Summary: I found installation flawless, and operation reliable. I've had no problems with this machine at all. I'm running Windows 98 and I scan into Photoshop. When I "Import", Photoshop opens the Epson Twain software and I am able to scan without any problems. I can also The quality is quite good for the money I paid. I'm quite pleased with the product. The only thing I don't like is in the software. I cannot access my scanned image in Photoshop until I close Epson Twain.
Excellent hardware, bad software, terrible support
Joseph C., Amazon
26 April 2001
Summary: I purchased the 1640SU scanner for our office. We use the scanner on our "image cneter" computer which is shared by everyone in the office. The hardware works well: the image and color quality is superb, and the scanning speed is pretty good. The TWAIN driver and control works well, and there's a simple "auto mode" for people who want to scan their documents without worrying about scanner settings.
Summary: While the scanner is a good one and I'm happy I bought it, it was VERY difficult to get it installed. The accompanying software for the twain driver was insufficient and it needed to be downloaded from the Epson website and unzipped. It took tech support hours to figure this out. I later found out that this is a normal problem with Epson scanners. My advice is to be sure to buy the extended warrenty/tech support if one is offered.