Client> # A fatal error has been detected by the Java Runtime Environment:
Client> #
Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6903b212, pid=3964, tid=6016
Client> #
Client> # JRE version: 7.0_25-b17
Client> # Java VM: Java HotSpot™ Client VM (23.25-b01 mixed mode, sharing windows-x86 )
Client> # Problematic frame:
Client> # C [atioglxx.dll+0xb212] DrvSwapBuffers+0xa2
Client> #
Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
Client> #
Client> # An error report file with more information is saved as:
Client> # C:\Users\user1\AppData\Roaming\.minecraft\hs_err_pid3964.log
Client> #
Client> # If you would like to submit a bug report, please visit:
Client> # [url="http://bugreport.sun.com/bugreport/crash.jsp"]http://bugreport.sun...eport/crash.jsp[/url]
Client> # The crash happened outside the Java Virtual Machine in native code.
Client> # See problematic frame for where to report the bug.
Client> #
Game ended with bad state (exit code 1)
Ignoring visibility rule and showing launcher due to a game crash
Deleting C:\Users\user1\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-2112722495227
Exit code 1 is usually something with the graphics driver, and the atioglxx.dll confirms that. Since it looks like an AMD graphics chip try updating it here: http://support.amd.com/us/Pages/AMDSupportHub.aspx
Try deleting the current .minecraft and re-downloading it. If that doesn't work restart your computer?