How to determine whether a computer is running a 32-bit version or 64-bit version of the Windows operating system
This article describes how to determine whether a computer is running a 32-bit version or 64-bit of the Windows operating system. Generally, a computer’s bit count indicates how much data it can process, the speed with which it can process the data, and the maximum memory capacity. In order to optimize the computer’s performance, the bit count of the operating system that is installed on the computer should match the bit count of the computer itself.
This article is intended for a beginning to intermediate computer user. You may find it easier to follow the steps if you print this article first.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2519427.