bill - 7:32 am on Mar 5, 2009 (gmt 0)

I reverted to an earlier drive image of my system, re-installed Opera 9.64 as an upgrade, and everything works fine now. (Thanks for the help!)

Maybe there's a glitch in the installer?

I will have to admit that the first time I upgraded I may have had a few other Windows programs running in the background. Perhaps one of them threw a monkey wrench into the works.

I'm glad this was just me. That said, it may be wise for people to remember to be careful when installing or upgrading software. These days it's easy to leave a lot of processes running in the background. It might be wise to remember to shut everything down first. Problems like this can still crop up.