First, once you install SP1 for Vista, you will see all the memory in the 32
bit version. Check with the manufacturer for suitability of installing SP1
on your system, you may need to update or reinstall certain system drivers.
Second, what you can do is exchange your 32-bit software for 64, but this is
best done through the system builder to ensure that you get drivers
appropriate for the hardware. Otherwise you can obtain 64-bit OEM media from
a source of your choosing and use your product key (it's valid for either 32
or 64 bit, you just have to choose the same version - Home Premium in this
case). You cannot use your product key with retail media.
Third, there is no upgrade process. You would have to wipe the drive and do
a clean installation.
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help - www.rickrogers.org
My thoughts http://rick-mvp.blogspot.com
"RikkJ" <RikkJ@discussions.microsoft.com> wrote in message
>I got a new HP PC with 4 GBs of RAM, but only about 3 show up. I know that
> this is because I'm running a 32 bit Windows Vista Home Premium build, so
> there a way to upgrade to 64 bit without buying another copy of Vista?