If you are running a modern Intel processor make sure HAXM (Intel® Hardware Accelerated Execution Manager) is installed:
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In Android SDK Manager, ensure the option is ticked (and then installed)
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Run the HAXM installer via the path below:
your_sdk_folder\extras\intel\Hardware_Accelerated_Execution_Manager\intelhaxm.exe or your_sdk_folder\extras\intel\Hardware_Accelerated_Execution_Manager\intelhaxm-android.exe
This video shows all the required steps which may help you to solve the problem.
For AMD CPUs (or older Intel CPUs without VT-x technology), you will not be able to install this and the best option is to emulate your apps using Genymotion. See: Intel’s HAXM equivalent for AMD on Windows OS