Thanks for your suggestions. It took a while to get this resolved but I wanted to report back.
I had thought that the ram was a likely candidate myself so I replaed the motherboard, processor and ram. Didn't help at all.
At that point, I became convinced that I had a a vst that ws causing the crash so I tried cleaning out vst folders. Still didn't help.
I finally contacted tech support and they walked me through doing a more thorough uninstall. This didn't solve the problem but it did exposé it.
After yet another reinstall, I was able to launch Sonar, but it would default to using WMD drivers. As soon as I would select Asio it would crash the machine.
So know knew that it had something to do with audio drivers.
After some experimenting, I figured out that it was dying when trying to scan the list of Asio drivers on the machine.
I tried a lot of things, but the one that finally worked was setting the .exe to run as administrator.
Makes no sense to me that this would suddenly be necessary. I'm wondering if a windows update may be the culprit, who knows? At least I'm back in action.
Thanks,
Greg