How do I reboot my XP Laptop in MS-DOS?

I noticed my HP Laptop does not keep the correct date and time. How do I reboot the computer in MS-DOS, so I can clear the CMOS to reset the BIOS settings?
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  1. MS-DOS won't clear the CMOS.

    You may need a new CMOS battery.

  2. If you are not able to change the CMOS battery for what ever reason you can also download and install a free time sync application. Each time you start your laptop (and it has a network connection) it will sync your laptop time. Just an alternate suggestion.
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