Safe mode is designed to boot your operating system with the minimum amount of software and drivers required. Neither startup programs nor drivers for nonessential hardware load in safe mode. This allows you to circumvent many viruses or conflicts in order to repair the problem or back up your data before a reformat.
Shut down your Dell computer and wait a couple of minutes before rebooting.
Press "F8" continuously as the computer reboots and until you see Windows Advanced Options.
Highlight "Safe Mode" with your arrow key, then press "Enter." Your Dell computer now boots into safe mode.