David Snowdon

I have exactly the same problem - downloaded this weekend onto Windows 7 on a Toshiba laptop. These are the messages that come up on the development console tab when the launcher fails:

[20:36:35 INFO]: Client> # A fatal error has been detected by the Java Runtime Environment:
[20:36:35 INFO]: Client> #
[20:36:35 INFO]: Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x05193e88, pid=5172, tid=4320
[20:36:35 INFO]: Client> #
[20:36:35 INFO]: Client> # JRE version: Java(TM) SE Runtime Environment (7.0_60-b19) (build 1.7.0_60-b19)
[20:36:35 INFO]: Client> # Java VM: Java HotSpot(TM) Client VM (24.60-b09 mixed mode, sharing windows-x86 )
[20:36:35 INFO]: Client> # Problematic frame:
[20:36:35 INFO]: Client> # C [ig4dev32.dll+0x3e88]
[20:36:35 INFO]: Client> #
[20:36:35 INFO]: Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
[20:36:35 INFO]: Client> #

[20:36:35 INFO]: Client> # The crash happened outside the Java Virtual Machine in native code.

[20:36:35 INFO]: Client> AL lib: (EE) alc_cleanup: 1 device not closed
[20:36:35 ERROR]: Game ended with bad state (exit code 1)
[20:36:35 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[20:36:35 INFO]: Deleting C:\Users******\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-53304231124206
[20:36:35 WARN]: Couldn't delete C:\Users*****\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-53304231124206 -