Problem Solved
I tried one called MEMTEST, which was in an archive with some other
diagnostics. This one ran, but didn't report any errors. The other one
called MD, which also came with a program called MQ, which would supposedly
"quarantine" the bad memory (by allocating it, not releasing it and then
quitting) that MD found. This crashed my system.
Sorry for the delay in responding, but my machine has been at the dealers
(not getting fixed, but thats another story…).
Gene.