Whenever you have trouble logging in to your Dell laptop the best way to fix the error is to perform a Startup Repair in Windows using Windows Recovery Environment. Follow the instructions below to complete the Startup Repair in Windows:
• Turn off the PC and unplug the cable when the Windows logo appears
• Repeat the above step until the Windows Recovery Environment appears
• When the Automatic Repair screen is visible, select ‘Advanced options’
• Click Startup repair and allow the process to fix or replace any corrupt files in your startup system.
If the given steps to not resolve the login error on your Dell laptop you can call the Dell laptop support number and ask for additional help.
Know More : https://www.contacthelp.com.au/dell-customer-care/