After about a day of using V6.0.9 on a "sandbox" computer, I decided to install it in the office today. It all went with barely a hiccup...5 machines in about 40 minutes. 2 running Win7 and 3XP. No problems with installation. At first glance, all machines run at V5 speeds (though the one Pentium 4 running XP has always lagged a little).
Thank you Jon B., AC programmers, and IT gods. No complaints from me today.
Give me a couple of days.