I had some ask me what is 32 and 64 bit operating systems and this was the simplest answer I was able to find that explains what it is doing.
64-bit versions of Windows Vista are for computer users who have high-performance needs and are typically running a computer with 4 GB or more of Random Access Memory (RAM). The terms "32-bit" and "64-bit" refer to the way a computer's processor handles information. The 32-bit versions of the Windows operating system can only use up to 3 GB of memory.
The 64-bit versions of Windows can use more memory and help reduce time swapping processes in and out of memory by storing more of those processes in RAM rather than on the hard disk. This, in turn, can increase overall system and application performance, especially with applications optimized for 64-bit.
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