Your Product Key is good for use on either version. Your license only allows
for use of one or the other as a single installation on one machine, not
both simultaneously. Which one you use is up to you. Should you opt to
remove the 32 bit and install 64 instead at some point, you will simply have
to reactivate via phone call after using the same key for installation.
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP http://mvp.support.microsoft.com/
Windows help - www.rickrogers.org
My thoughts http://rick-mvp.blogspot.com
"edgardumea" <email@example.com> wrote in message
> Hi !
> A while ago I bought Win Vista Ultimate retail pack. It came with a 32 bit
> version of the OS and the 64 bit version as well. Only one key.
> I have already installed the 32 bit version & used the license key.
> What if later, after I upgrade my computer with a 64 bit processor & so
> I want to reinstall Vista & decide to put the 64 bit version ? Am I
> to use the same license key ? If not, why did the retail box came the 64
> version too ?