There have been a lot of issues reported recently with nVidias 378.49 drivers. They are working on a fix but in the meantime the best course of action is to not update to that version. Alternatively you can try uninstalling 3D Vision as that has been reported to solve the problem for some users. There are a few things to look out for to identify whether this is the cause of your crash, these will be in your logs.
Edit: nVidia have released a new driver hotfix addressing this issue: http://nvidia.custhelp.com/app/answers/detail/a_id/4378/
- Game ended with bad state (exit code -1073740791)
- 21.21.13.7849 - This will be on a line in relation to your graphics card and is the version number of the affected drivers.
- The coremod X does not have an MCVersion annotation - This message isn't something to worry about and appears in logs under normal circumstances, however if your log ends and you have a line like this as the last thing in the log it could be this issue.
Edit: nVidia have released a new driver hotfix addressing this issue: http://nvidia.custhelp.com/app/answers/detail/a_id/4378/
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