UE is locking up when building lighting

Just bought a new machine -

Nvidia Geforce GTX 870
2.8 GHTZ
16 Gigs Ram

I started a new project, deleted the chairs and ran lighting rebuild in preview mode. Machine locks-up every time, including other sample scenes.

Works fine on my Alienware 18 laptop.

Need some help,

I noticed another issue - I couldn’t load the 4.7 beta which might have worked better on my machine.

I have to return the laptop and purchase another if UE will not work with this graphics card -


I am only rebuilding lighting to take away the shadow left from the two chairs in the start-up new Scene.

Fixed it!!

How did you fix it?