Thanks all!
It was a "clean" install of Windows 7 and had to reinstall ALL of my software. I now have all of the available Windows updates and have updated all drivers.
Today (01/18), everything seems to be working well with Windows 7 and all programs. Sonar works as well as I'm used to (it will still crash once in awhile as did 8.0/8.5/X1d/X2 - and just did, leaving the MIDI Monitor running on my taskbar!). I'll have to reboot now, because if I try to restart Sonar, it will tell me there are no drivers.
This evening I tried again to run the Symphonic Strings installer. I clicked "run as administrator" and went back to some other activities (like getting a bowl of ice cream for my wife) and looking at this forum to see if anyone had answered.
After about 30 minutes, while reading some posts, the installer window popped up and I started the install. The installation completed and now I'm going to reboot and give it a try. I have no doubt that it will work, but it sure is strange!
Thanks again!