Windows 10 has a built in Screen Record function. It is built into the Xbox game system in Windows 10.
To Access just [ Click ] on the Windows Start Button.
Then Press the Windows Key + G
You will see several overlay windows. Look for the one with the title “Capture”. Click on the Push Pin at the top Right corner of this window to fix it to your desktop.
Now just click off the window and the window called “Capture” should now be on top of everything with four(4) big round buttons. Click on the dot to start screen recording.