Registry entry for Explorer.exe

Hi

I am using 64 bit Vista

While booting up Vista is loading 32 bit version of Explorer.exe

I checked the registry for shell which is
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

shell = "explorer.exe"

what else i should do to make 64 bit version of explorer.exe to load as default shell

Any ideas?

from
nayeem khan