The program is not responding

Software
2

Mmm, not sure what is going on, but could you try the latest build of the 5.1 branch (soon to become 5.1.6)?

It sounds very similar to Kicad (5.1.5)-3 - #13 by Piotr, you may need to not enable the accelerated graphics mode if you have very little RAM available.

Try to edit the following file in text editor:

%APPDATA%/kicad/eeschema

And change the value of canvas_type:

canvas_type=2

to disable openGl.