Problems with connecting with emulator

When I tap the button Emulator it says me Starting the Android Emulator Please wait: This might take 1 or 2 minutes

When it starts connecting I am putting it for too much time (for example 15 minutes) and continuously said me this:

Broken AVD system path. Check your ANDROID_SDK_ROOT value

How can I fix this problem?

There are other emulators you can try at