BIOS (Basic Input Output System) is firmware that loads when you initially boot a computer system. The BIOS interfaces with connected computer hardware and loads the specified operating system from the hard disk drive. Occasionally, manufacturers release updates to the BIOS to make the system compatible with newer hardware and software. You download updates specific to your Dell computer BIOS and update the BIOS through a process called flashing. Most computers require you to flash your BIOS using floppy disks and a Windows boot disk, but Dell offers an option that allows you to flash your BIOS directly from the hard drive.
Open your Internet browser and visit the Dell Home User Support web page (see "Resources").
Click the "Drivers & Downloads" button, then click the green "Enter a Tag" button beneath "Choose by Service Tag." This feature allows you to input your Dell computer service tag number and automatically have access to the correct drivers and updates specific for your computer.
Enter the service tag of your computer into the "Enter a service tag" field. The service tag is a five to seven alphanumeric string printed along with a barcode on a sticker on the back or side panel of your Dell computer tower or on the bottom of your Dell laptop.
Click the "Operating System" drop-down menu and select your computer operating system from the list.
Click the "Category" drop-down menu and select "BIOS" from the list.
Scroll down and click "More Download Options" next to the BIOS file (beneath the "Download" button). The "File Formats" page appears.
Scroll down and click on the download link below "Hard Drive." Save the file to your desktop. This file package updates the BIOS directly from your hard drive in Windows.
Close your Internet browser, then right-click the downloaded file and select "Run as Administrator" to automatically unzip the contents of the package and begin the installation.
Click "Continue" when prompted, then click "OK." The system closes any open programs, shuts down Windows, updates the BIOS then restarts the operating system.