Updating windows key
Your boot CD/DVD may or may not help depending upon how the BIOS stands after a powercut or a sudden system turn off while rewriting the BIOS.
Install the following update: KB 2885698: Update adds support for Windows 8.1 and Windows Server 2012 R2 clients to Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012 KMS hosts (see Windows Server 2012 R2 & Windows 8.1 KMS Service Activation).
Thus needless to say the BIOS is very crucial when it comes to the functionality of your Windows 10/8/7 computer.
BIOS is, after all, a piece of software that needs to be regularly updated, just to the operating system or the apps in general.
If your computer is working properly, you do not need to update or flash your BIOS.
In any case, should you wish to, we recommend that you do not try to update your BIOS yourself, but instead take it to a computer technician who may be better equipped to do it. Once the System Information Tool opens, you can check the BIOS version.
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For Windows 10, 8, 8.1: For Windows 7: Download the Windows update troubleshooter file and double-click on it after download and follow its on-screen instructions to apply the troublesooter fix.