UE 4.15.1 not launching/responding when hit 'launch'

I just installed UE 4.15.1. When I hit launch, it says ‘please wait’ for few seconds and returns back to ‘launch’ icon. Nothing else happens in between or after. I tried running as administrator but its still the same.

I use windows 7; 133GB free HDD; 4GB RAM; Intel i3

Hey Gobi84,

For issues with the Epic Games Launcher, please visit http://help.epicgames.com/

The site contains various troubleshooting guides, but if they do not have the information you need to solve your issue, you can use the Email Us button on the side of the page to get in touch with one of our support staff.

Have a great day