To fix lost password in Windows XP, first start PC and press <F8> to bring up Boot options menu. Choose to boot into "Safe Mode". You will not be asked for a password in Windows XP when you boot to Safe Mode. Then Click <Start> then <Run>. In the <Run> box type "nusrmgr.cpl" and hit <Enter>. The windows user account control should start. From there, just open your account and delete the password. Close out everything and Restart to normal. Your password is now gone.
Type user name Administrator and press enter then go to my computer and right click on my computer go to manage and click on local user and groups then double click on user and then right click on ur user name having abc and click on set password then set ur new password and relogin ur account .