Windows 7 All-in-One For Dummies
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Windows 7 Home Premium is available in both a 32-bit model and a 64-bit model. Although both types of Windows 7 look and act the same on the surface, the way they work is quite different. How do you choose between the 32-bit and 64-bit versions? It really boils down to your needs and capabilities.

The 32-bit flavor of Windows has a limit on the amount of memory that Windows can use. It really can only see 3.4 or 3.5 gigabytes (GB) of memory. Even if you put 8GB of memory into your computer, the 32-bit version of Windows can only use about 3.5GB. The rest just sits there, wasted.

On the other hand, the 64-bit flavor of Windows 7 can use much more than 8GB of RAM. Whether you need that much additional memory is debatable, but some power users will definitely want the extra memory.

There’s one more good reason for running a 64-bit flavor of Windows 7: security. There are strict security constraints on drivers that are used to support hardware in 64-bit machines —constraints that just couldn’t be enforced in the older, more lax 32-bit environment.

And that leads to the primary problem with 64-bit Windows: drivers. Because of the stricter requirements, many hardware manufactures don’t feel like it is worth their while to create 64-bit drivers for their older hardware. So, if you go the 64-bit route, you’ll need to ensure that your devices have 64-bit drivers available, or you’ll need to replace some hardware.

If you're thinking about going the 64-bit route, you first need to find out whether your computer can even handle it. On a Vista computer, you can find that information by following these steps.

  1. Click Start→Control Panel→System and Maintenance→Performance Information and Tools.

  2. Click View.

  3. Under System type, see what version of Windows you're currently running.

  4. Under 64-bit capable, see whether you can run a 64-bit version of Windows.

    The 64-bit capable listing won’t appear if you’re already running a 64-bit version of Windows.

If you’re starting out with completely new hardware and you plan to run your PC for a long, long time, 64-bit Windows 7 makes a lot of sense. In the long run, you’ll be better prepared for the future.

On the other hand, if you have older hardware that you want to use with Windows 7, do yourself a favor and stick with 32-bit Windows. It’s unlikely that you’ll start feeling the constraints of 32 bits until your current PC is long past its prime.

About This Article

This article is from the book:

About the book author:

Woody Leonhard describes himself as a "Windows victim." Since 1992, he's been sharing the solutions to his own tech problems with millions of readers. In addition to writing several books in the For Dummies series, Woody is a Contributing Editor for Windows Secrets newsletter. He also runs his own blog at

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