I activated an update for the app store on my brand new macbook air abd it gor to 95% completed and has now frozen cant do anything not even turn it off!!

my macbook air has frozen updating an the app stores app, got to 95% complete.............. Help

Reinstall OS X
To reinstall OS X, go  > Restart.
When your computer restarts, hold in both the Command (⌘) and the R keys until you see the OS X Utilities window pop up.
If you are not connected to the internet, choose a network from the Wi-Fi menu in the right corner of the menu bar (in the top right corner of the screen).
Select Reinstall Mac OS X, click Continue, and follow the instructions.
 Austin

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