Why is Unreal 4.12 is freezing up during a build?

Hi. When I try to build my level (lighting and what not) UE4 freezes up. Why is this happening, and what can I do to stop this freeze and continue with my projects?

Thanks

Hello, make sure all plugins are disabled

Thanks, I disabled them all (is there a way to enable any I might need later?) but the engine is still crashing. Is there anything else I could do?

Try deleting the binaries, build and Intermediate folder from your project