To find out if your computer is running a 32-bit or 64-bit version of Windows in Windows 7 or Windows 8, do the following:
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Open System by clicking the Start button
, right-clicking Computer, and then clicking Properties.
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Under System, you can view the system type.
If the system is running 32-bit operating system, kindly update it to 64-bit operating system (which is the minimum requirement) and try to install QuarkXPress 2015 again.
Please check System Requirements for more information