Thank you for your input.
In searching for a solution to my Win7 Pro network problem I have been over all of the settings you mentioned before I posted my question and found no problem , everything is as required to have a complete network and the network was fine other than the occasional missing links I described in my original post. The only addition to the PC configuration since the network was originally set up was automatic updates by MS update.
The good news is that as I have researched this to the max, I found 2 posts in the Win7 network forum that combined provided the fix for my network problem.
As I have been researching this I have noticed many people are having similar network issues. I know there are many reasons for connectivity issues, so the solutions are specific to the problems, but if other network users are experiencing the problem of multiple instances of Microsoft 6to4 Adapter and local network error 0x80070035 the network path was not found the solution I located has worked for me.
If you would like to know more reply to this feed.
c.maresca