You've answered part of the problem - Norton.
Uninstall it. You'll see an immediate improvement.
As
@swee'pea99 says, run defraggler, after going to the drive properties, and running disk cleanup.
So long as the drive is fully functional, you should have an almost as new laptop. Try it. If nothing else, it will show you how to keep the new one running sweetly. Warning: if your new machine has a solid state drive, DO NOT run any sort of defragmentation program such as Defraggler. It will harm the device.