Can not install epson perfection PHOTO scanner to Windows 7 computer. bit drivers. TWAIN drivers for the scanner part are included. All important information about the Perfection Photo / GT-X scanner of From entry-level software SilverFast SE to professional version SilverFast Ai. (Left): If 35mm slide scanning produces good results with the Epson Perfection PRO, then medium format should really sing. And now, with the 's Missing: TWAIN.