I would like to sell or donate an old laptop, a Toshiba Satellite T235D-S1345, 64 bit, Windows 7. I know I need to wipe the hard drive but would like to keep the preinstalled games that came with the laptop for the next owner. I have already deleted my account and assigned the administrator as "John Doe." I uninstalled my programs and deleted personal files, deleted temporary internet files, and emptied trash bin, but what other steps do I need to take to completely eliminate the chance of any of my personal data being recovered by anyone? Is there a program I can use to "wipe" any possible remaining personal data and still leave the games?