AOK for now thanks.
downloaded the network install version of SP3, XP Media Edition, still locked up, but reran it for s and giggles, of course locked up again. But thru it all not exactly sure why, I have a functional OS, as far as I can tell, running for two weeks or so. Serving web apps.
ps. SP3 also locked up on my girlfreinds other 2005 vintage compaq tower Home edition, at a different spot early in the install, was able to recover staying on SP2, wanted more pain but SP3 ran fine on my 2006 vintage compaq Home edition lapttop.plus an old, old pentium 3 compaq.
probably not going to mess with SP3 anymore.