If you do not have windows password reset disk or another administrator account on Dell Windows system, you can use Windows Password Recovery tool to help reset Dell password without losing date.
Here we would like to recommend the best Windows Password Recovery software to help you reset lost or forgotten dell Windows password. You can use this software to create a bootable windows password reset CD/DVD or USB flash drive to reset a forgotten Dell password in minutes. Just four steps:

Step 1: Download Windows Password Reset Personal and install it on another computer.
Step 2: Create a Dell password recovery disk. You just need to run the software and burn it to a blank CD/DVD or USB flash drive.
Step 3: Insert the disk to your dell laptop or desktop, set it to boot from the Dell password recovery disk by changing Device Boot Order.
Step 4: After booting from the disk, Windows Password Reset will run automatically and display a friendly interface. Then you can reset whichever account password of Windows operating system on your Dell laptop/desktop. Just need a few clicks(click your user name and click "Reset Password").

Скачать Dell Laptop Password Recovery бесплатно на странице загрузки.