Press Ctrl+Shift+Esc to open Windows Task Manager. In a single dual core system you’ll see CPU 0 and CPU 1, from here you can check or uncheck the core you want the application to use. In the Processor Affinity dialog, you will see 32 check box options, only the number of cores in your processors will be available to set affinity to. Now right-click on the process and select Set Affinity. In the Processes tab the specified process will be highlighted.
If you don’t know which process is associated with which application, go to the Applications tab and right-click on the application name and select Go To Process. Press Ctrl+Alt+Delete to open Windows Task Manager, and go to the Processes tab and look up for the process name that you want to set the affinity for. Although you cannot set priority to system services but you can set affinity to applications like Google Chrome, Firefox or any Anti-Virus, in this way you can achieve a good overall performance. If you have a dual or quad core processor, then you can set affinity to an application to control which core of the processor an application can use, in this way you can assign one application or a program to use only one processor while other application can run on other processor. In Windows XP, Windows Vista, and Windows 7 applications by default run on all available cores of the processor.
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