Every time I press the "play" button the launcher acts as if starting up the game (the launcher itself shuts of).
However after about 5 seconds the launcher pops back on with the message
"Game Crash
An unexpected issue occurred and the game has crashed. We're sorry for the inconvenience."

And the log output only shows me this:

20:08:22 launcher Using default game log configuration client-1.7.xml (outputs XML)
20:08:23 bes Setting user: sgtGranny
20:08:24 bes LWJGL Version: 2.9.4
20:08:29 launcher Process closed with exit code -1073740791
20:08:29 launcher

I can't figure it out myself. Could really do with some help!
Regards,

sgtGranny