32-bit and 64-bit Windows: frequently asked questions
Here are answers to some common questions about the 32-bit and 64-bit versions of Windows.
What is the difference between 32-bit and 64-bit versions of Windows?
How can I tell if my computer is running a 32-bit or a 64-bit version of Windows?
Which version of Windows Vista should I install: the 32-bit version or the 64-bit version?
How do I tell if my computer can run a 64-bit version of Windows?
Can I upgrade from a 32-bit version of Windows to a 64-bit version of Windows?
Can I run 32-bit programs on a 64-bit computer?
Can I run 64-bit programs on a 32-bit computer?
How can I find programs and devices that work with the 64-bit version of Windows Vista?
If I'm running a 64-bit version of Windows, do I need 64-bit drivers for my devices?