Ah, yes, well, permissions make a *whole lot* more sense, in that
case.
I'd love to have a solution at the ready, but I just got done
installing XP 64-bit, with intentions of installing Win7 64-bit
shortly..
Having used 7 64-bit, and recalling similar quirks at the prompt, I
suggest you fiddle with launching the 32-bit cmd.exe from within
\SysWOW64\ ..
Without having a native install of 7 to work on, I can't speak any
further to what permission-issues, specifically, are worth looking at.
As soon as I get this dual-boot situation hammered away, I'll reply
again with anything I dig up.
Best wishes!