Ken gave you the info about registration and activation. If you have a
bunch of personal information on your laptop, you cannot depend on just
deleting or uninstalling programs to protect you--the data can still be
retrieved with free or inexpensive software. What I recommend is that you
format the drive on the PC and then reinstall the system and any software
you are selling with it. When all the tweaks, updates, etc., are done
installing, defrag the drive. Then use a program like the one below to
overwrite all the "blank" space on the drive. That is the process I use
when I clean up a PC for sale. I also install all the updates (I have a
cable modem) since that makes for a selling point for most people: fresh
installation of system and all updates.
Eraser:
http://www.heidi.ie/eraser/ Freeware that overwrites the "blank"
data on a
hard drive.