If You’re Buying a New Computer… (Windows 7, 32-bit vs. 64-bit, maximum memory)
First, if you’re thinking about buying a new computer, I’d wait for Windows 7, which is due out 6 weeks from the date of this post. This new version of Windows arrives on store shelves on October 22, 2009.
Yes, you can buy a Vista system right now with a free upgrade to Windows 7. But why go through the hassle of the upgrade process? If you wait just a few weeks, you won’t have to.
32-Bit Versus 64-Bit
Second, you’re going to have a choice between a 32-bit system and a 64-bit system. About half of the systems currently on the market right now are one; about half are the other.