[plt-scheme] Cannot install 207 on Windows

I've downloaded
http://www.cs.utah.edu/plt/download/207/plt/plt-207-bin-i386-win32.exe
and run it.  It appears to complete successfully*, but when I run
`drscheme' from the Start menu, Windows tells me that it cannot find
drscheme.exe and goes off and searches for it (and never finds it).

*If I pay attention while the installation is running, I see a message
from Windows that says something like `mred has generated errors; an
error report log is being generated'.  Naturally Windows gives me no
hint where that log is (or else I'd attach to this message any useful
information that I might find in it).

So there are really two problems:

* the original error

* the fact that that original error slips by unnoticed

In any case, it's easy to repro the error, but I still don't know how
to get PLT installed.

-- 
If you can't change your underwear, can you be sure you have any?