I have an RX680 and everything is working in Win 7.
I would suggest uninstalling the 680 and all the Epson software, including the printer drivers
and the scan program. Physically disconnect the 680 from the PC then restart the PC
. After Windows 7 starts, do a new install starting with the printer drivers and ONLY connect the 680 to the PC when the Epson install program tells you
(if you connect it first either the install will fail or incorrect drivers can be installed by Windows). After you have the printer drivers installed and the 680 has been detected and installed, THEN install the scanner drivers.