Echoro

Control Panel < System and Maintenance < Backup and Restore Center - this will allow you to create a full system image backup to a network/external drive. Alternatively, you could do a manual backup to a network or external drive. Failing that, some third-party software could make this a little easier for you.

Do you use any software that could affect key combinations? Try adjusting your language settings, this should reset your keyboard layout once changed (just remember to revert these settings). I have included a screenshot below presuming you are Windows 10.

Are you able to try plugging the microphone into the front IO? Failng that, try enabling/disabling the microphone enhancements under Control Panel < Sounds < Microphone Try using a 3 pole 3.5mm and then a 4 pole 3.5mm replacement cable.

This is quite common if you have interference, like you would hear through some phonecalls... How is the microphone powered?

Try using KeyFinder by Magical Jelly Belly. It is a free to download utility that retrieves your Product Key used to install windows from your registry. https://www.magicaljellybean.com/keyfinder/ Alternatively, what have you tried? - Try activating Windows through Settings < Activation - Use CMD to reinstall the Product Key (https://www.howtogeek.com/245445/how-to-use-slmgr-to-change-remove-or-extend-your-windows-license/)