The registry is split into user files (1 per user = HKEY_LOCAL_USER/HKEY_USERS) and machine files (HKEY_LOCAL_MACHINE and HKEY_CURRENT_CONFIG etc).

And as for ActiveX objects being enabled by "many many users" then I'd suggest only crazy people would. IE lets you enable such things by zone, so many might enable them for Intranet sites or Trusted sites, but not for Internet. Anyone sufficiently savvy to get that far would SURELY know not to enable ActiveX objects for then Internet zone.

As for installing OSX, does Safari have NO vunlnerabilities?! Are you sure?

Interesting how people still manage to try to slag off Vista when it's the one NOT affected.