Support Team has put out two useful Knowledge Base (KB) articles to relay information on upgrading and/or installing Windows Vista from Windows 2000 or Windows XP.
- KB 932616: Installation choices for consumer versions of Windows Vista (32-bit only)
- KB 932795: Installation choices for 64-bit consumer versions of Windows Vista
If you have questions on the Windows Vista upgrade or installation processes, I suggest reading these KB articles for more detail before you proceed.
On a related note, Support has noted that some users of some systems running certain spoken languages supported by Windows XP have experienced problems when upgrading to Windows Vista. Take a look at this KB article to learn more about this issue and how to work around it to ensure a successful Windows Vista installation.