xamarin android player (emulator) wont start properly

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Xamarin

hi , i downloaded xamarin android player (android emulator) when i start the emulator i get an error message saying the emulator timed out continue to wait yes /no? if i select yes after a while the emulator starts , and the (emulator screen) keeps on flashing , thought it might be the version of the model ? but it also do it with nexus 4 /5 /7 ??
if i unlock the device it hooks on the main screen??