You only started the aiStarter app you installed to use the emulator. You clicked on the aiStarter icon on your desktop... see #1, then you see a normal black screen that demonstrates that aiStarter is running correctly, next you need to start the emulator (go to Connect > Emulator shown at #3,#4
Use the advice here http://appinventor.mit.edu/explore/ai2/setup-emulator for more details.
Were you able to start the emulator?
Regards,
Steve