If you are copying the entire old HD to the new, your AV defs. will copy at the same time. Otherwise, you will have to download them again, as they do more than just sit as def files - there are program updates as well. You can, of course, short-curcuit the process by buying a more up-to-date version which will cover you for the next years. £12 will get you Systemworks 2003 click here.