Here is a small tip to help you how to modify the number of cores of a CPU to be activated when Windows Vista or 7 boots up. Here are five simple steps:
1. Go to Start, type "msconfig" in the search box and press Enter.
2. System Configuration utility windows should open up. Click on "Boot" tab and then click on "Advanced options" button.
3. Click on "Number of Processors" check box, and select the number of cores, depending on your processor (dual, tri or quad core CPU), in the below drop-down list.
4. Click on OK button to save the changes.
5. Click on OK button again to apply the changes.
6. You will get a window asking for your confirmation to restart the computer. Click on "Restart" button to confirm the same.
That's it!
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