Way 1. Use Previously-created password reset disk Step 1: Sign in Windows with a wrong password, and then click OK to close the error message. Step 2: Click the Reset Password link to open the Password Reset Wizard. Step 3: Insert the previously-created password reset disk in computer, and click Next. Step 4: Select the inserted password reset disk and click Next. Step 5: Type a new Windows password and password hint, and then click Next. Step 6: Click Finish button when Windows password reset is done.
Way 2. Use another Windows administrator account Step 1: Sign in Windows via another administrator account. Step 2: Type “user accounts” in the search box and select User Accounts in the search results. Step 3: User Accounts windows will open, with All Windows user accounts displayed. Step 4: Select the user account that you want to reset password of. Step 5: Type a new password twice, a password hint once, and then click Change password button.
If you forgot your old Dell Inspiron e1505 laptop login password, there is another tool called SmartKey Windows Password Recovery. I think you can have a try. Check out http://goo.gl/EhHaNV for more details.