Are you trying to run EPSDISK on Windows 2000? If so, that is your problem...
EPSDISK makes direct BIOS calls to perform its operations. Windows 2000 (and NT for that matter) prohibits direct calls to the hardware, so EPSDISK will not work in these environments.
EPSDISK and EDM will work under DOS, Win3.x, Win9X, and WinME, but not NT and 2K...