If you can get to it in Safe mode, or with the boot disk...do this: Click Start -> Settings -> Control Panel -> Users and Passwords for this to appear: Click the check box at the top for the [set Password...] button to be activated. Select Administrator from the list of users, then click [set Password...] for this to appear: Key your new password twice, then click [OK] to return to the previous dialog box. Click [Apply]. If you don't want to have to log in every time you boot the machine, deselect the check box at the top again, then click [Apply]. You may get a pop up window that tells you to specify the user that will be logging in regularly. Type your username (from the list) and enter a password, or leave it blank, then click [OK], and [OK] on the previous dialog box. I hope this works for you.