IE7 and FreeTextBox (install error)

A few weeks ago, Christopher Vaugn from the dev deam contacted me
asking me to update to support IE7’s new user agent string.
After first, I was embarassed to know that I had coded it in such a way
that it wasn’t forward compatible, but then I realized that it’s
probably better to have FreeTextBox render a fully-functional downlevel
TextArea rather than a rich editor that had broken JavaScript if IE7
changed somehow.

Yesterday, I downloaded my beta copy of IE7 from connect.microsoft.com
(I’m still downloading … 2.47 GB!!), so I could do actual testing
on it before releasing a compatible version. But I got an error message
on install,

“the data area passed to a system call is too small”

IE7 install error

I have a really bad case of and need to reinstall my machine, so
I might need to rebuild before I can get it to work. If any one has any
clues as to why the install doesn’t work for me, I’d appreciate any
help.