A window popup, select your animation folder, and select all the images you have created.
Then to render to a video, you need to change the render output to FFMPEG.
And select render animation.
Blender will use the image sequence to render the video for you.
I use for this a new blender project!
Blender project 1 to render animation as images (.PNG)
Blender project 2 import these images sequences, and render animation to video
Good luck, let us know if it helps you Blender crash problems.