Alain Joshua Camasura said:
Do i have to reinstall the OS like KristianAA said?
You may have to re-register, but not re-install. If you were switching motherboards I'd say yes, but if it just the CPU it should detect and install the correct drivers itself, and you'll have to reboot several times in the process. When Windows detects the change in CPU it may ask you to activate your install again, but once you go through the steps with your current product key, it will be fine. I switched my i5 2500K to an i7 3770K with an OEM copy of Windows 7 and it works fine.