Hi,im planning to switch from i3-3240 to i7-3770 on my lenovo ih61m motherboard.Im just wondering do i need to do a fresh install of windows or i just need to take out the cooler,swap my i3 with the i7,but back the cooler and im good to go.Also when i do a first boot with the i7 will something odd happen or something i shuold be aware of?