The Basic Input/Output System (BIOS) is a firmware interface that initializes hardware components on a computer system. It is responsible for booting the operating system and providing a way for the user to configure hardware settings. On a Vista computer, the BIOS can be accessed by pressing a specific key during the boot process. The key that you need to press will vary depending on the computer manufacturer, but it is typically one of the following: F1, F2, F10, or Delete.
Once you have entered the BIOS, you will be able to view and change a variety of settings. These settings include the boot order, the time and date, and the hardware configuration. You can also use the BIOS to update the firmware on your computer.