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64-bit stands for 64 bits per cycle. Each computer can process a certain amount of bits per cycle and this factor is one of the most countable when it comes to the processing power of a machine. Sep 29, 2009
When running on x64 hardware, you have two options. First, to run in native 64-bit mode. This means all the applications running need to be 64-bit. The second is to run worker processes in 32-bit...
Sep 3, 2008
 I, and most people use, a 32-bit (x86) version of Windows. “So what?” you may...Aug 5, 2008
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NXTEST
 Starting with Windows XP Service Pack 2 and Windows Server 2003 Service Pack 1, Windows supports a new security enhancement called Data Execution Prevention (DEP). This feature prevents execution of program code in memory regions which normally do not contain any program code, such as the program stack, the process heap or data segments. Certain types of viruses or worms infect computers by provoking a buffer overrun in a vulnerable application to insert and execute their own, malicious code. With Data Execution Prevention (DEP) such attempts will be detected by the CPU and stopped by the operating system, thus ending a vulnerable application instead of allowing it to infect the computer with a virus or worm.
Note that this will not secure you from any malicious executables you may run voluntarily, such as e-mail attachments or downloads from unverified web sites, which may contain a virus, worm or trojan. NXTEST is an application which allows you to check if Data Execution Prevention (DEP) is active on your computer by attempting to execute program code from a data segment, the process heap and the program stack, and reports whether all attempts were prevented by the operating system or not. REPORT TO US: This software is not 64-bit native!!! 
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