Most likely your current HP version is OEM.
http://support.microsoft.com/kb/932795/
(An upgrade Product Key requires that you revert to XP SP2 prior to using it
to install x64 from Vista x86.)
See section:
Installing Vista x64 on a system already running 32-bit version of Vista.
Just follow the instructions.
Key factors in being successful:
1. Make sure all drivers needed are available out there. They must be x64
versions to work.
Some components still have trouble until x64 is installed. You may want
to remove them first:
a. Creative sound cards.
b. SLI graphics
c. Mixed SATA and IDE drives. (only have one installed while installing
x64)
When done, put them back in one at a time.
2. When installing, elect not to update Vista until you are all done.
3. If for some reason, it errs prior to complete install, just start the x64
DVD again. You don't have to install XP again.
To make uses of all memory, ensure you "remap" the memory hole through your
BIOS. If this function is not available in the BIOS, you may need to update
the BIOS. If still not available, I would question the need to go to x64.
As everyone will be happy to point out semantics... this is not an upgrade,
but a clean install. Nothing will survive so copy all your files first to a
safe location.
E-mail addresses transfer by WET.
Good luck!
Let us know how it goes.
I've been on x64 since Vista was released and it's rock solid.
"Seidell23231" <> wrote in message
news:60BE1E54-48E0-4BA1-9874-...
> Hello ALL,
>
> About 8 months ago I purchased Vista Ultimate Upgrade, because I was
> upgrading the PC I had than from XP Pro to Vista Ultimate. Upgraded all
> went
> smooth no problems.
>
> Fast forward to today. The old PC has passed on and a New PC (HP
> Pavillion
> Elite m9150f with Intel Core 2 Quad) is home and getting setup. The new
> PC
> came with Vista Home Premium 32-Bit. I have upgraded it to Vista Ultimate
> 32-Bit, BUT I want to use the 64-Bit since my PC can handle it.
>
> My Question is this ~~ Can I upgrade to Vista 64 with my current
> allocation?
> If YES, please explain, if NO please explain how to fix so I can use
> 64-Bit.
>
> Thanks ~~ Gunny