After installing Android Studio, when you open (for the first time) you choose the theme and the following screen appears:
IfIdo'Retry'doesnothing,ifIdoCancelthefollowingmessageappears:
I was facing this same problem in Windows 7 when I started Android Studio from the Start Menu Shortcut ....
Solution:RunasAdministrator
TheproblemwasoccurringbecauseofdiskpermissionsonDriveC:.RunningtheprogramasanadministratorenabledittorunthedownloadofallrequiredcomponentsandnowIcanopenAndroidStudionormally.