When I press play on the launcher, the launcher just pops up again a few moments later.

[23:09:23 INFO]: Launching game
[23:09:23 INFO]: Unpacking natives to C:\Users\James\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-47418341685680
[23:09:24 INFO]: Launching in C:\Users\James\AppData\Roaming\.minecraft
[23:09:24 INFO]: Looking for orphaned versions to clean up...
[23:09:24 INFO]: Looking for old natives & assets to clean up...
[23:09:29 ERROR]: Game ended with bad state (exit code -1)
[23:09:29 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[23:09:29 INFO]: Deleting C:\Users\James\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-47418341685680
[23:09:29 WARN]: Couldn't delete C:\Users\James\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-47418341685680 - scheduling for deletion upon exit