Hi, Chris.
It can be done, ;<} but it's tricky. :^{
You'll need the Retail Upgrade package, which will include the license to
upgrade from WinXP.
But there is NO upgrade path from 32-bit ANYTHING to 64-bit ANYTHING (or
vice-versa) because of hardware differences, requiring different drivers.
So, even with a license, you'll still need to do a "clean install" of the
64-bit Vista. The Vista Ultimate retail package includes two DVD-ROMs, one
for 32-bit and one for 64-bit, plus a single Product Key. You can choose to
boot from either DVD and use the single PK to activate the ONE you choose.
The problem with upgrading is that Vista does not use the previous method of
simply "looking at" a qualifying CD to verify your right to upgrade. It
must be able to see a qualifying Windows version already installed. You
need to insert the Vista DVD-ROM and run Setup.exe. When it gets to the
point, you choose to do a "Custom Install", which will reformat your WinXP
partition and clean install Vista in its place. Since your WinXP license is
no longer valid after you use it to qualify for the upgrade to Vista, you
are no longer licensed to use that WinXP, anyhow.
With a Full Retail package (not an upgrade), you still cannot simply
"upgrade" from 32-bit to 64-bit. You still need to do a clean install of
the 64-bit version. Or keep WinXP and install Vista alongside it, creating
a dual-boot system.
Read this KB article:
Installation choices for 64-bit consumer versions of Windows Vista
http://support.microsoft.com/default.aspx/kb/932795
Then backup all your data files (especially those family photos and emails
and your financial files) that exist nowhere else. Be sure that you have
64-bit drivers for your essential hardware, and installation media for all
your essential applications.
After you install Vista Ultimate x64, you can re-install your apps and
restore your data.
RC
--
R. C. White, CPA
San Marcos, TX
(e-mail address removed)
Microsoft Windows MVP
(Running Windows Live Mail beta 2 in Vista Ultimate x64 SP1 beta v.275)