I uninstalled SS&D 1.5 via Add/Remove Programs, accepted reboot, and installed v. 1.6.2.46, accepting all defaults and suggestions except changed D: to F:, and immunized.

I now understand more about Prefetch than I did. I will keep watch on D:\Windows\Prefetch.

The Spybot scan found 133 tracking cookies. I clicked on "Fix selected problems", so they are gone.

...chris