You can use the Trinity Rescue Disk (TRK) to remove the admin password, basically setting it blank. If you're just going to use a new hard drive though, then you don't need it. Likewise you could also just format the hard drive, but of course that would erase all the data you had on it. You could us TRK to boot the laptop up as a file server and store the files on another computer on a network. You could also use a drive enclosure to turn the hard drive into an external hard drive and just drag and drop the files to a folder on another computer.