When im opening the minecraft launcher, pressing the play button, its loading, then the launcher window re-opens again. same thing happens if ill press play again. i found this in the developer console:
[15:18:34 INFO]: Client> Error: Could not find or load main class net.minecraft.client.main.Main
[15:18:34 ERROR]: Game ended with bad state (exit code 1)
[15:18:34 INFO]: Deleting C:\Users\leonid\AppData\Roaming\.minecraft\versions\1.7.4\1.7.4-natives-3112130738545
[15:18:34 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[15:18:34 INFO]: Client> Error: Could not find or load main class net.minecraft.client.main.Main
[15:18:34 ERROR]: Game ended with bad state (exit code 1)
[15:18:34 INFO]: Deleting C:\Users\leonid\AppData\Roaming\.minecraft\versions\1.7.4\1.7.4-natives-3112130738545
[15:18:34 INFO]: Ignoring visibility rule and showing launcher due to a game crash
please help