Few days back, both Windows Virtual PC and Windows XP Mode were RTM’d and today Microsoft has made available both packages to MSDN and TechNet subscribers.
The rest of the users will have to wait until October 22nd to get their hands on Windows Virtual PC and Windows XP Mode.
Both x86 and x64 versions are available for x86 and x64 operating systems respectively. Windows XP Mode package is the same for both x86 and x64 environment. To grab downloads sign in your account and navigate to Applications > Windows Virtual PC
For more information on Windows XP Mode, including feature highlights etc…