Thankyou so much! I also have an Epson Perfection 1640SU scanner. I was almost resigned
to not getting it to work under Win.7 64bit, as the Epson site did not provide a Win.7
64 bit driver
for it. (The 32 bit ver driver did not work). Your solution of modifying
the ES27.inf file worked perfectly! For others the download link that pcspecialist
provided to epson is no longer valid. However just go to the epson.com site and search
epson12180.exe. Download it and click on it to start it. At the install window choose
to extract the files.
Once files are extracted do not continue with the installation. First go to:
Navigate there and find and open the ES27.ini file by clicking on it. Notepad opens.
Find the three instances of the USB\VID_04B8&PID_011B and replace with USB
\VID_04B8&PID_010A and save and close the file.
Now go to Device Manager. Find it by going to the start button and clicking on help.
Search for Device manager. Open Device Manager. Find Imaging Devices. There will be
your scanner that is not working. Right click on it and choose update driver and
software. Browse to c:/EPSON/epson12180_twain_driver_and_epson_scan_utility_304a and
select that folder. Let it run to install.
Now go to Control panel/Hardware and Sound/Devices and Printers. You will find an icon
for the Epson Perfection 1640 scanner there. Right click on the icon. Select start
scan. And you are in business!
If you like right click on the icon and select create shortcut. This will place a
shortcut to the scanner on your desktop, which is more convenient to access. I also
created a folder in My Pictures/Epson Perfection scanner to save my scans to. Remember
for each scan to select .jpg or .bmp and then Preview. Then you can use your mouse to
close crop to the preview image before doing the final scan. Once scan is done, type in
an appropriate file name for your scan and save it.
Thanks again to pcspecialist, this saved a trip to buy a new scanner.