1.Delete the old AVD and create new AVD. Might your AVD got corrupt. 2.if doesn't work Restart your eclipse and try again. 3.if doesn't work Go to C:\Users\(username)\.android folder and deleted both the avd and cache folders. (it may not be necessary to remove both, I didn't check any further). This might help you !! 4.http://stackoverflow.com/questions/4974568/how-do-i-launch-the-android-emulator-from-the-command-line If none of them help re-install the sdk and eclipse.
2.if doesn't work Restart your eclipse and try again.
3.if doesn't work Go to C:\Users\(username)\.android folder and deleted both the avd and cache folders. (it may not be necessary to remove both, I didn't check any further). This might help you !!
4.http://stackoverflow.com/questions/4974568/how-do-i-launch-the-android-emulator-from-the-command-line
If none of them help re-install the sdk and eclipse.