I see this question asked once every week or two. We covered this topic in a tech tip ahead of Windows 7's launch. It's almost two years old, but still every bit as relevant as the day it was written. Please read our guide before starting a new thread about the difference between 32-bit and 64-bit Windows. If you have further questions after reading the guide, by all means start a new topic.
Should You Install Windows 7 32-bit or 64-bit?
With the upcoming release of Windows 7, the question is raised again on whether you should install the 32-bit version (x86) of the operating system or move up to 64-bit (x64).
This is something that's been asked since the introduction of consumer-level processors bearing the “x64” nomenclature. It feels like just yesterday that Intel and AMD fanboys were at odds over the Athlon 64. At that time and even as recently as the introduction of Windows Vista, software and drivers for 64-bit setups were slim-pickings.