I had the same issue after my computer locked up and I had to power cycle it.
Wiping the user data didn’t fix my problem, I had to delete the following folders manually
C:\Users\%UserName%\.android\avd\AVD2.1.avd\cache.img.lock
C:\Users\%UserName%\.android\avd\AVD2.1.avd\userdata-qemu.img.lock