Thanks for the response; will keep it handy.
I was too impatient and did not wait and went ahead and followed forum instructions posted elsewhere to do a clean uninstall. Then I installed new build. When I launched Parallels Desktop, it found the Vista install I had before so Vista loaded up fine.
However, despite I had activated Vista before under the 5160 build, it messaged that I need to activate; which I tried to do online, but it referred me to call-in. Fortunately after answering some questions from the guy at the call center, I was able to get re-activation code.
Everything is working great. I get shared folders b/t Mac and Win, network connections are fine, printing is good, and full screen works great.
Thanks to all posters on this forum, it's a great info source.