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Your password troubles and the windows version are likely separate issues. Migration of local accounts to the modern setup is something a monkey could accomplish to be honest. It is not hard.

i know how you are feeling. i also wanted to roll back to Windows 7. lately i upgraded to windows 10, but what caused a trouble was that my previous password was not allowed in windows 10. windows 10 user locked out. i don't know how to do. so i just had no choice but to downgrade it to windows 7 again. 

@Amenda Security refers more to firewall and antivirus than anything else.

I rarely use security app on Android, but I use data back and recovery software onmy computer, just in case i wrongly delete data on my android phone. i wonder if this is security app?

Check the current version of the BIOS against the version you are upgrading to. Also it may be a good idea to obtain a copy of your current version should you need to roll it back for any reason. Use a reliable power source. Don't trust your battery with a laptop. Plug it in. Use a UPS with a desktop if possible. Ensure that you have the appropriate boot media for your system if needed. In most cases on modern systems the process can be completed with a utility that runs in Windows but this may not be the case with older systems. You may need a bootable floppy disk or CD-ROM for the process older systems. For modern systems that use an executable within Windows it is a good idea to ensure everything is patched and up to date before you attempt the firmware upgrade. Also close any unnecessary programs that may be running before you start the process. The utility for upgrading your BIOS will vary by manufacturer, but is usually a straight forward process as long as you take some simple precautions and read the documentation before attempting the upgrade.