Windows XP is almost NEVER in "64 bit".
You have to specifically purchase XP 64 bit, as opposed to regular XP which is 32 bit. 64 bit processors will run 32 bit XP without problems, but you'll get a little more performance and some extra features (GUID partitions) on 64 bit windows.
Once again - it's "always" in 32 bit, unless you go buy 64 bit.
64bit
Windows Professional x64 Edition
Yes. All editions of Windows Vista have a 64-bit version available. There are also 64-bit versions of Windows Server 2003. Windows Server 2008, and Windows XP Professional.
Yes. All editions of Windows Vista have a 64-bit version available. There are also 64-bit versions of Windows Server 2003. Windows Server 2008, and Windows XP Professional.
Yes. All editions of Windows Vista have a 64-bit version available. There are also 64-bit versions of Windows Server 2003. Windows Server 2008, and Windows XP Professional.
Windows 7 Home Professional 64-bit
Windows XP Professional x64 Edition
Since it runs with Windows 7 (which is a 64 bit operating system) - then yes.
Minimum System Requirements:Operating SystemsMicrosoft Windows XP Home Edition (Service Pack 2 or higher)Microsoft Windows XP Professional (Service Pack 2 or higher)Microsoft Windows XP Professional x64 Edition (Service Pack 2 or higher)Microsoft Windows Vista Home Basic (32/64 Bit)Microsoft Windows Vista Home Premium (32/64 Bit)Microsoft Windows Vista Business (32/64 Bit)Microsoft Windows Vista Enterprise (32/64 Bit)Microsoft Windows Vista Ultimate (32/64 Bit)Microsoft Windows 7 Starter (32/64 Bit)Microsoft Windows 7 Home Basic (32/64 Bit)Microsoft Windows 7 Home Premium (32/64 Bit)Microsoft Windows 7 Professional (32/64 Bit)Microsoft Windows 7 Ultimate (32/64 Bit)Required for all installationsAbout 480 MB free space on the hard drive (depends on the size of the antivirus database)CD/DVD Drive for installation of the program from CD ROMComputer mouseInternet connection for product activationMicrosoft Internet Explorer 6 or higherMicrosoft Windows Installer 2.0
Windows XP 64 bit.
To use 64-bit specific applications, you must purchase both a 64-bit processor and a 64-bit version of Windows. 64-bit applications will not run on 32-bit versions of Windows, even if a 64-bit capable processor is installed. You also cannot install a 64-bit version of Windows on a 32-bit only processor.
Yes, except for Windows XP 64-bit and Windows Server 2003 64-bit with Itanium processors.
no