XP Admin Password

Neither have I made any rescue disk nor do I have any other user with Admin privileges.
Yesterday,I set the password on to the Admin account and restarted the PC 2/3 times. It worked perfectly, with the same password.
But today when I openend my PC and tried to log in as Admin, it gave ERROR: Password not correct.
I am doubly sure that the password I remember is the correct one.

Try this and see if it works.
http://home.eunet.no/~pnordahl/ntpasswd/

Please note the instructions before use though...

BLANKING PASSWORD, * at the password prompt, IS NOW RECOMMENDED instead of changing the password. Reports say that blanking will work better in most cases.

How important are your files that you cannot access?
You have a few options and you need to choose and try one or more.

1). Logon as Administrator with blank password.

2). If you have an account with Administrative right, use that account to logon and then reset your password.

3). IF the aboves do not work, you need a third party software.
Do a web search with key words "Lost Administrator Password in Windows XP" and you will get a list of software that are available.
Basically there are two kinds, one, a commercial software that hack or reset the passowrd for about $70 or more, and another,a free software that provides a boot disk to reset the password.
The difference is commercial ones guarantee the integrity of Windows after resetting the password whereas the freeware do not. You need to read every single line and choose any software accordingly.

If you can regenerate without too much inconvenience, you may consider starting from scratch (installing Windows, drivers, applications, and so on)

This question was closed by the author