Hi Dave, sorry about your problems there, I have been searching everywhere for the email I was sent from the driver update centre to see if I can find the EXT one but can't find it (I will keep looking). I think all the drivers listed on the email were update ones so the 1_0_1_8.exe might be shown on that. I'm suprised that all the other users with the EXT haven't been able to give you a copy of theirs.
I did have a few occasions where I had ethernet and USB conflicts. All I can think is maybe the remnants of the 'wrong' install you had are still lodged in your system. (If you look in your windows directory you should find a folder marked Epilog drivers where it sends them to when you unwrap them for the first time).
I would (if it were me) completely remove the Epilog drivers and reinstall from your original install discs, that should at least put the settings back to the originals. Then I would try to reinstall 1_0_1_4.exe to see if it rectifies your problem.
I might be clutching at straws here for you but it's all I can suggest at the moment. In the mean time hopefully someone who owns an EXT will stepup with the correct files for you.