I am going to transfer an old hdd to my new computer that I built myself. My hdd is a 2-3 year old 320 gb seagate hardrive. Are there any risks in this?? Also I want to upgrade the windows xp on my old hdd to windows 7 would I need to uninstall windows xp and do a complete install of windows 7? There is nothing in my old hdd that would be of use for me