I am fully aware of how often this is asked, but I want to know my best options for doing this without buying a new OS. I have a new Gigabyte motherboard that I am planning to use as a replacement for an old Emachines board. I will be using my same Athlon II X2 CPU and have thermal paste on the way. I do not have the original install disc for my 64-bit Home Premium OEM. Could I just install the new motherboard and have Windows boot up fine, then use my current keys to do the phone activation method that many people recommend? Would a flash drive be helpful for booting from a downloaded ISO or using a restore program like Acronis or Paragon? Any help is greatly appreciated.