BIOS stands for basic input/output system. The BIOS is firmware that's built into the motherboard that is responsible to initializes the computer's hardware as the computer is being booted. After successful boot it then searches for a boot device such as an optical drive i.e. CD/DVD ROM or a storage drive i.e. Hard Disk or SSD to boot an operating system.
i have download Backtrack 5 r3 and install it in VMware, everything went smooth unit when i start the GUI. The display was very small, as i am not a Linux pro, i started to here and there to change the screen resolution.