George,
Do a Google search on "MSVCR71.dll was not found" and you will see that a lot of programs can cause this. I was shocked to see that many different programs causing having the same error.
It appears this is actually a Net.Frame 1.1 file and Microsoft does have a couple support articles on it -
http://support.microsoft.com/kb/326922 &
http://support.microsoft.com/kb/827073.
Admin there are also some MSDN articles on how to avoid this problem.