So I'm building a new computer, but I also have to buy a copy of windows 7 because I don't have a disc ( this computer atm is just a dell pre built ) or key. So on the new build I'm also going to go ahead and get a new hard drive. Now I want to be able to use all the stuff I have on the hard drive, but how? Do I just plug it into the new mobo along with the old hard drive and continue with installing the new windows or what? Thanks for any help.