"Wildman" wrote

| registry program under Wine. That could be done
| from a thumb drive with Linux installed with
| Wine. I mean "installed", not a live CD/DVD.

There are boot CDs. I've used one successfully,
but I don't remember now which one. It's been
awhile. I'm pretty sure it was either Hiren's or
UBCD. It boots to XP and includes 2 or 3 Registry
editors. These days maybe there's a Win7 version.
I don't know. I also don't know if there's any issue
editing 64-bit Registry from 32-bit windows. Probably
not, but I don't know for certain.

The down side with such boot CDs is that they
typically have lots and lots of tools but the tools are
only included if they're free. Often there's not much
that's actually useful.