CMOS checksum invalid (162 system option not set) error solution 

In this video tutorial you will learn how to fix the computer date and time problem, changes automatically on reboot.
If your computer or laptop BIOS looses its date/time on reboot and display error messages like " system option not set" or "CMOS checksum invalid", it means that the CMOS battery needs to be changed.
The CMOS (Complementary metal-oxide-semiconductor) battery powers your Computer BIOS firmware. When the CMOS battery starts to lose power and strength, the BIOS starts to lose data and the computer can begin to not work correctly.
So, Watch the video to learn how to change CMOS cell in a computer.
#CMOS

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