[Blind-sysadmins] screen capture software

Hi. Need to use a accessible free screen capture software for windows server 2019. Need to capture the screen, then save them as a png or other images. Need to do this for a network lab and to show my trainer what I have done inside windows server 2019 inside hyper v manager. Any ideas. Have tried different software. Either not accessible or not able. Unless have to create a auto hot key script to do this. Thanks.