Hi Tony.
First try uninstalling and reinstalling back the printer software. You should be able to locate Epson printer software under installed programs in control panel. Keep USB cable to printer disconnected during the process. If Epson software is not listed in installed programs, simply install software.
To reinstall the software download updated drivers using the link below:
Here the download page.If reinstalling the software did not fix the problem, test the all in one using a different computer. You will need to install the downloaded software before connecting the printer to the second computer.
If the scanner does not work with second computer, then it is faulty. Possible faults are wiring to scanner optical sensor loosing connection and printer going out of memory while scanning because of a defective control board. In that case the unit must be disassembled and repaired. The repair will likely need new parts.
Regards.
Ginko.