I had forgot my password before. 
and look through all the internet. 
there are some methods I find. 
You can access the Administrator account through the login prompt 
without logging into safe mode. If the computer utilizes the welcome 
screen instead of the standard NT domain login prompt, you can press 
Ctrl + Alt + Del twice to get to the login prompt. This is only true if 
you are running Windows XP Professional Edition. Windows XP Home Edition 
will also allow you to use this method to log on. 
If it doesn't work above , you can try to use"windows password key 8.0 "to get back the password !  http://www.lostwindowspassword.com  
hope it can help you. 
good luck.