The program is not responding

My system is an Intel Core 2 Duo E7500 @ 2.93 GHz, 2 GB Ram and the OS, Windows 7 Ultimate(64 bit). I installed KiCad (5.1.5) -3 release build today. When I tried to run the program, it runs at first, but when I open a new project, the program goes to ‘Not Respondenting’, and I am unable to do anything even after about an hour. The same thing happens every time I open a new project.

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)?

https://kicad-downloads.s3.cern.ch/index.html?prefix=windows/testing/5.1/

It sounds very similar to Kicad (5.1.5)-3, 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.