i put toghether a new computer 2 days ago. i had a hewlett packard and what i tried to do was reuse my old hard drive so i didnt have to buya new copy of windows. when i start it up i log into windows like normal but the nextscreen says that windows isalready activated and if you hit ok it logs you out. do i have to buy a new copy of windows or can i reconfig my hd and reload windows?