Thanks for the information--hmm two computers are just about Pentium 4 and the latest Avast anti-virus version which is supposed to be compatible with XP wigged out two machines bring them to a stand-still with the latest Avast version.
Funny thing, in the forums, there was not in the main page, but a side link saying if you have xp, win 7, win 8, etc--click the appropriate one to download the exe file.  When I checked them, they all had the same version number as the one the main screen

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