32-bit & 64-bit Windows: FAQ by MS Help & Support

What is the difference between 32-bit and 64-bit versions of Windows?
The terms 32-bit and 64-bit refer to the way a computer’s processor (also called a CPU), handles information. The 64-bit version of Windows handles large amounts of random access memory (RAM) more effectively than a 32-bit system.

How can I tell if my computer is running a 32-bit or a 64-bit version of Windows?
To see if your computer is running 32-bit or 64-bit Windows, do the following:
1-Click to open System.
2-Under System, you can view the system type. Click to See Example

Can my computer run a 64-bit version of Windows?
To run a 64-bit version of Windows, your computer must have a 64-bit-capable processor. If you are unsure whether your processor is 64-bit-capable, do the following:
1-Click to open Performance Information and Tools.
2-Click View and print detailed performance and system information.
3-In the System section, you can see what type of operating system you’re currently running under System type, and whether or not you can run a 64-bit version of Windows under 64-bit capable. (If your computer is already running a 64-bit version of Windows, you won’t see the 64-bit capable listing.)

Can I upgrade from a 32-bit version of Windows to a 64-bit version of Windows?
No. If you are currently running a 32-bit version of Windows, you can only perform an upgrade to another 32-bit version of Windows. Similarly, if you are running a 64-bit version of Windows, you can only perform an upgrade to another 64-bit version of Windows.
If you want to move from a 32-bit version of Windows to a 64-bit version of Windows, you’ll need to back up your files and then perform a custom installation of the 64-bit version of Windows. For more information, see Installing and reinstalling Windows‍‍.

Can I run 32-bit programs on a 64-bit computer?
Most programs designed for a computer running a 32-bit version of Windows will work on a computer running 64-bit versions of Windows. Notable exceptions are many anti-virus programs, and some hardware drivers.
Drivers designed for 32-bit versions of Windows do not work on computers running a 64-bit version of Windows. If you’re trying to install a printer or other device that only has 32-bit drivers available, it won’t work correctly on a 64-bit version of Windows. For information about updating drivers and troubleshooting issues with device drivers for 64-bit versions of Windows, contact the manufacturer of the device or program.

Would I benefit from using a 64-bit computer?
The benefits are most apparent when you have a large amount of random access memory (RAM) installed on your computer, typically 4 GB of RAM or more. In such cases, because a 64-bit operating system can handle large amounts of memory more efficiently than a 32-bit operating system can, a 64-bit system can be more responsive when running several programs at the same time and switching between them frequently.

If I’m running a 64-bit version of Windows, do I need 64-bit drivers for my devices?
Yes. All hardware devices need 64-bit drivers to work on a 64-bit version of Windows. Drivers designed for 32-bit versions of Windows don’t work on computers running 64-bit versions of Windows.
To learn how to check for drivers, see Update a driver for hardware that isn’t working properly or go to the device manufacturer’s website. You can also get information about drivers by going to the Windows 7 Upgrade Advisor website.