Hi markyG0l, You will need to use Dell Backup and Recovery to restore the system to factory defaults. Please follow the steps provided below to restore the system to factory defaults: 1. Boot Windows 8 into the login screen.2. Click on the “Power” icon on the bottom right corner.3. Hold down the “Shift” key and click “Restart”.4. The system restarts and boots to "Choose an option" screen, click “Troubleshoot.”5. Click the "Dell Backup and Recovery" icon.6. The system restarts and comes back up, click "Next" on the Dell Backup and Recovery Screen.7. The system would be checked to see if the smart repair option can fix the issue, click "Next" once this is done.8. You will be prompted to select the backup to be used, click the factory image option. Click "Next."9. You will be prompted to backup your files, if needed do so by selecting the option "Yes, backup my personal files" (Make sure to have an external backup hard drive handy.) or select "No, Erase my files."10. The system goes ahead and completes the restore of the operating system. Click "Restart" when prompted.  11. Follow the on-screen instructions to setup the system with windows. Please let me know if you need further assistance.
I forgot my administrator password on my Dell inspiron 15 3520, its a windows 8 and I have two cd's that came with the laptop. 
Forgot windows password and no backup/password recovery disk made...