Windows XP does not allow a DOS program to take control of the hardware (including the com port) so the DOS TRiLOGI program that is used for programming the E10 PLC, when runs under Windows XP, NT or 2000 will have trouble communicating with the PLC.
Your best solution is to use a DOS diskette or Win95/98/ME startup disk to boot your PC into pure DOS mode and then run the DOS version of TRiLOGI software in pure DOS mode.