If you're trying to clear a boot password set in the BIOS, you may need to open the computer and search for a password clear jumper. I don't recall ever working on a Fujitsu, so I have no idea where it is if there is one.
If you're trying to get rid of a Windows login password, there's a utility called chntpw that can clear it. The page for chntpw is here
The utility is distributed in the form of a disc image file, which you use to create a bootable CD. Once you have that, you boot the computer from the disc, answer a few questions, let chntpw do its magic, and the next time you boot Windows the password is gone.
On the page linked above, scroll down 'til you get to "download" and get the latest version (cd080802.zip). Unzip it (Windows can do that) and you'll have a file with an "iso" extension. This is the disc image that you'll use to create the CD. Use your CD burning software's "burn image to CD" option to make the disc. (If you need a good free burner application, here's one
Here's where it seems mysterious. Boot your computer from the CD. A lot of stuff (and I mean A LOT) will scroll by but you can ignore it all. You'll then have to answer some questions, but simply accepting the default answer is normally all you have to do. There is a walkthrough
on the page that shows you what you'll see and explains the process. Read through it and it's really pretty clear.
It sounds complex and scary, but once you've downloaded the utility and made the CD it takes no time to run. Probably less than you're spending reading my answer. It's quite a handy tool to have. I use it a lot myself when servicing computers; you'd be surprised how many people forget to mention they have passwords (or they've forgotten what it is).
Good luck, and thanks for using Fixya!