if your running out of room or the old drive is failing..you may be better off using a drive clone program and cloning your whole drive to the new one. if the data is fine on the new drive then you can wipe the old one or use it as a back up.
Of course ur software is not pirated. Else, whole would bother too go to such an extend to transfer the software. The question is what type of software r u using. Most of the software r available as 1 month free use download/ or with computer magazinesas free goodies on their dvd. If that is the case u can just install and input ur serial number and connect via the Internet to activate it. one problem here is the version number. Sometimes the sites keeps a few older versions. Mostly u need ur legit serial number and ur installed version number should match.