This problem has likely been addressed 10,000 times considering how useless the documentation of the ADT both online and in print. Using Eclipse, Target Android 1.5, and the unedited example of "HelloActivity.java" , with a simple 1.5 virtual device: I receive the following errors [2011-08-03 20:32:19 - Emulator] invalid command-line parameter: Files. [2011-08-03 20:32:19 - Emulator] Hint: use '@foo' to launch a virtual device named 'foo'. [2011-08-03 20:32:19 - Emulator] please use -help for more information which are utterly incomprehensible. Would someone please tell me what is going on. Utterly frustrated.