Android Emulator is not showing up after upgrading Android SDK

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http://stackoverflow.com – I have a problem. My AVD are working fine until I upgraded my SDK to 4.2.2. After a I clicked Start button of AVD manager its not showing up. I tried to delete the device but I get an error msg The Android Virtual Device 'Test Device 4' is currently running in an emulator and cannot be deleted. Please help. (HowTos)