Though it is possible to reset the BIOS settings by clearing the CMOS memory manually, here is a simple, tiny application called CMOS De-Animator to help you do the things quickly.
This utility allows you to invalidate the checksum of your system's CMOS memory, resetting all settings to default and clearing any stored BIOS passwords (if any) upon re-boot.
The main advantage of my utility is that it can work under every Windows operating system, and no administrator privileges are required
The utility has no GUI - only a confirmation message to begin or exit, error handling messages and a success dialog box upon successful operation. The utility is very portable, no installation required.
Interested readers can download CMOS De-Animator for Windows 7/Vista/XP(32bit/64bit) at here