Bypassing Passwords....
Do you have a copy of the operating system that is on the laptop? If it is a problem with XP, just put the disc in, have your system boot off of that disc and choose the "Repair" option when it comes up. Watch your screen and when it says "Loading System Devices" in the lower left corner, press and hold "Control" and hit your F10. This will then open a window and you will be allowed to go in and change or delete Admin passwords or change it to one you remember! Remove your disc from the CDROM drive and restart your machine. It has worked for me in the past when someone had an Admin password they never set.
Beats the heck out of replacing a hard drive. That advice sounds like it came from an HP tech reading from a script. A few years ago they would just tell you to reformat and recover.