First you can log in under ADMINISTRATOR (superuser) account and from there you can change passwords for any account defined on that computer. Of course to be able to do that, you have to know what's your administrator password, but I assume you have no clue for that one either...
The best option then is to reset your account password. You can do this using either 1 of the 2 methods suggested by Microsoft Knowledge Base article #321305.
IMHO, the second method described on this page is most likely the easiest way for you:
1.) Reboot Windows in Safe Mode (I'm assuming you know how to do that, so I won't explain it all over again).
2.) Click on
START button, and then click
RUN.
3.) Inside the
OPEN box, type the following command, and then click
OK:
control userpasswords2(type it exactly as you see it, with space in between those two words - control and userpasswords2 ) 4.) Click the
user account that you forgot the password for, and then click
Reset Password.
5.) Type a new password in both the
New password and the
Confirm new password boxes, and then click
OK.
DO NOT TOUCH other options...
Good luck !
