Walt's suggestion: Go to preferences - behavior and change Job priority from Normal to Low and your computer should remain responsive during the conversion
I had already done this, but that doesm't ensure system reposiveness, Windows XP's task manager itself doesn't get control until a task does I/O or executes a WAIT instruction. Believe me, on my system, conversion still brings my system to it's knees, even with calibre-parrall running at low priority. Yhw real solution, of course, would be to purchase a newer system, but I am retired trying to make it on a fixed income, so the option that I will go with, is read this book on Calibre instead of my Kindle.
Thanks for the suggestions.
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