Android Emulator Error "emulator: ERROR: the user data image is used by another emulator. aborting" [duplicate]

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Emulator problem in Android

emulator: ERROR: the user data image is used by another emulator. aborting

most of the time i face this problem..I restart Eclipse even..and restart emulator also..but still problem remain as it is. Why ?

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Problem : emulator: ERROR: the user data image is used by another emulator. Solution: Delete following folders: C:\Users\%UserName%.android\avd\AVD2.1.avd\cache.img.lock C:\Users\%UserName%.android\avd\AVD2.1.avd\userdata-qemu.img.lock

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In your Android SDK and AVD Manager (under the Window menu if you cannot find it), launch the emulator by clicking the Start button. On the next screen tick the Wipe User Data box then click Launch.