If you try many way, can’t finish.

1、reinstall android studio  : remove all

2、delete all 

c:\user\your user name\.gradle

c:\user\your user name\.AndroidStudio2.0

3、reinstall android stuido 

be careful path and directory, C:\Program Files\Android   check this directory, have other Android Studio, likfe Android Studio1….. If have delete Android Studio1 directory, only keep Android Studio.