Glenn, it's been a few days. Did you get it figured out?
I ran into the same thing. Running Sample Tank (VST) as admin didn't clear the message. You need to run SHS (or whatever host you are using) as admin.
As a side note, if you have the ST from the group buy, DO NOT load ST Free on the same machine.
I have the group buy installed on my XP PC, so it's ok.
But when I originally tried to download ST Free, the only one showing in my user area, was actually still the one from the group buy (ST2-XT). Thinking I was downloading ST Free, I installed it on my laptop (where I use MC5 as the host).
After mucking around a bit, I got the real ST Free to show up in my user area, so I downloaded that, and installed it.
Well, It overwrites the original, as both install simply as ST 2.xx.
Problem was, the original serial number was still in place, and did not match what the authorization wanted.
It was easy to fix, with a system restore to before I started, and re-installing ST Free.
Perhaps an odd situation, but I wanted to see what was included with the free version, just for reference.
The included library is much more extensive than the old ST Free, and I really like the idea that a user can expand it without having to buy a different version of the core program.
It may not be too exciting for experienced users who have a well rounded collection of VSTi's, but I highly recommend it for newer users looking for more variety in their sounds.