If you've lost the administrator password on a WNT/2000 upwards computer, you are stuffed unless you have access to strong cryptographic tools. But all is not lost. Hard drives are cheap these days. Buy a new one. Install your operating system on it from scratch (you might have to jump through a few hoops if you've upgraded or got it pre- installed- borrowing off a friend might be easier).

Then install the old disk as a slave drive- you change a jumper on the back. Now you should see the old drive as a new secondary drive (it came out as E: on mine). You can now copy all your data over to the new drive, and live happily ever after, remembering your password this time.

Another way, if you have plenty of spare space on the drive, is to install Linux as a second operating system. Linux works best if you have (a) a broadband internet connection and (b) an Ethernet DSL modem. This is because you'll probably need to install all sorts of drivers, that come from the internet, to get the system up and running, and obviously you can't install the USB modem friver for the internet connection, cos you haven't got an internet connection till you've installed the drivers, same for WiFi...

Having done that, install an NTFS file system (it usually doesn't come as standard, so broadband again), then access your disk as before. And you'll probably like Linux so much that you won't go back.