I think if you are running an OS supported by this beta, you have the VB6
runtime already installed.
There are multiple files involved--one or both of those KB articles will
list them, and the question is whether their versions are the same--i.e. all
the files the same version. The only way I know to determine this is to use
explorer to look at each file individually.
This isn't a catastrophic issue--nothing bad happens--no data loss. If you
have both products installed, and Microsoft Antispyware doesn't show the
system explorers, just install the SP. It isn't terribly large, and the
installation process, while slightly unusual, shouldn't be a big obstacle.