Solution 1: try restart ADB server
Create file restartADB.bat in folder
c:\Program Files\Android\android-sdk-windows\platform-tools\
Write into restartADB.bat this code:
adb kill-server && adb start-server
pause
Save restartADB.bat file.
If you want restart adb.exe server, run restartADB.bat by double click on icon.
Solution 2:
Delete Run Configuration
One from solution if application do not want run in Android Emulator from Eclipse. Every click on run will started new Android emulator window.
Try restart ADB server from command line in:
c:\Program Files\Android\android-sdk-windows\platform-tools\
restart adb.exe server
adb kill-server && adb start-server
Solution 3:
Try delete:
c:\Documents and Settings\user_name\.android\avd\my_avd.avd\cache.img
c:\Documents and Settings\user_name\.android\avd\my_avd.avd\userdata-qemu.img
Try solution 4:
Eclipse menu select Window->Preferences->Android
Windows 32
FROM: C:\Program Files\Android\android-sdk
TO: C:\PROGRA~1\Android\android-sdk
Windows 64
FROM: C:\Program Files (x86)\Android\android-sdk
TO: C:\PROGRA~2\Android\android-sdk