I'm unfamiliar with a multipurpose job like the cx3600, but is the scanner function listed in Programs?
If it is then
I would uninstall the scanner.
Shut down and remove the usb connection
Boot up again and install the scanner from the Epson disk but dont plug the USB lead in until Windows asks for it.
I believe the Twain driver is part of a Windows system file modified to make sense of the Epson product and available to both Picture scanning and OCR software.