You need a more powerful computer. You should check out the system requirements for running the Unreal Editor and perhaps build something more in line with those, or at least buy a graphics card. I tried to run Unreal Engine on the school computers that didn’t have fast enough hardware and I had a similar problem.
You can find the system requirements here:
Just out of curiosity, what specs does your computer have?
If you have any further questions, feel free to ask me.
Goolog