If you want to clear CMOS memory from Windows, which resets BIOS settings to default, you can use CMOS De-Animator utility for that. CMOS De-Animator allow you to invalidate checksum’s of your system’s CMOS memory, resets all settings to default and clears any stored BIOS passwords if any upon reboot.
This utility doesn’t a have graphical user interface. Run the utility, click ‘OK’ for the confirmation message to clear CMOS memory.
CMOS De-Animator is freeware and portable, runs on all Windows operating systems, no administrator privileges required.
Update: Download link has been removed from this post since too many users reported their anti-viruses found this program as a virus.
December 7, 2014: CMOS De-animator v3 download link (Majorgeeks), this file has been uploaded to VT and the result is: it is clean.