Well, the environmental variable fix *may* have worked. I realized that right about the same time I tried that fix I also uninstalled System Mechanic. The virus checker part of that program wasn't active, but it was memory resident, so maybe that was blocking the installation. I don't know--I'm just stating this to be clear--and I don't much care now, but maybe if you have System Mechanic installed maybe you should check that, too.
