ArcMap 10.2.1 window doesn't pop up

I have installed ArcGIS 10.2 version on my desktop and successfully installed and authorized the software. but after installation when I click on All Programs --> ArcGIS --> ArcMap 10.2.1 program, I don't see any window open. I am stuck here.

I have windows 7 desktop and 800 GB HDD. I have installed student edition on my desktop.

Please help me.