I am in a loop and confused and cannot find the answer I am looking for. I have a windows XP computer that is powerful enough t handle windows 7 professional perfectly fine. My question is, the full retail is $225-$335 range while a coworker said to em I can do a clean install with an OEM disc. Is that possible? Also, I can buy online oem reinstall discs for $10-15 online but no coa. Can I still install windows 7 and use my windows xp coa from my desktop to activate? or should I just go ahead and buy the same oem disc but with a coa for $40 dollars more. Any help will be greatly appreciated.