If anyone has access to a Windows XP install, could you please try running the builds from ticket https://trac.torproject.org/projects/tor/ticket/10252?
Specifically: https://people.torproject.org/~gk/testbuilds/torbrowser-install-3.5-alpha-1p... https://people.torproject.org/~gk/testbuilds/torbrowser-install-3.5-alpha-1p...
Any reports from other versions of Windows is also useful, of course.