I looked on the Epson site and they didn't list a Vista driver for the perfection 1200U scanner. I had a duel boot config but didn't like to go to XP just to scan a document. I did not want to replace a perfectly fine scanner. I found a fix to the problem in Vista32 (I think it works as I didn't try it) using the instructions found here. However, that didn't work for my Vista64 build. There was a link in that forum to another forum where someone got his perfection 2450 to work using a modified INF file from the 4990 driver. Link To get the 1200U to work I used the line:
%ES4F.DeviceDesc% = USB.ES4FXP.x64,USB\VID_04B8&PID_0104
instead of the line described in the PlanetAMD64 link (I found my device ID from the error message when trying to install the 1200U using the 1200U xp driver). I can't use Epson Twain in Photoshop but when I select the 4990 everything now works fine.
%ES4F.DeviceDesc% = USB.ES4FXP.x64,USB\VID_04B8&PID_0104
instead of the line described in the PlanetAMD64 link (I found my device ID from the error message when trying to install the 1200U using the 1200U xp driver). I can't use Epson Twain in Photoshop but when I select the 4990 everything now works fine.