Loader screen starts, Mojang screen comes on but returns to log in screen. This happens on both laptops using 1.7.10. Turned off firewall, ms security essentials turned off, tried reinstalling java and minecraft on both pcs.

[23:34:27 INFO]: Client> #
[23:34:27 INFO]: Client> # A fatal error has been detected by the Java Runtime Environment:
[23:34:27 INFO]: Client> #
[23:34:27 INFO]: Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x05dd3e88, pid=3572, tid=2948
[23:34:27 INFO]: Client> #
[23:34:27 INFO]: Client> # JRE version: Java(TM) SE Runtime Environment (7.0_60-b19) (build 1.7.0_60-b19)
[23:34:27 INFO]: Client> # Java VM: Java HotSpot(TM) Client VM (24.60-b09 mixed mode, sharing windows-x86 )
[23:34:27 INFO]: Client> # Problematic frame:
[23:34:27 INFO]: Client> # C [ig4dev32.dll+0x3e88]
[23:34:27 INFO]: Client> #
[23:34:27 INFO]: Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
[23:34:27 INFO]: Client> #
[23:34:27 INFO]: Client> # An error report file with more information is saved as:
[23:34:27 INFO]: Client> # C:\Users\KaitlinM\AppData\Roaming\.minecraft\hs_err_pid3572.log
[23:34:27 INFO]: Client> #
[23:34:27 INFO]: Client> # If you would like to submit a bug report, please visit:
[23:34:27 INFO]: Client> # http://bugreport.sun.com/bugreport/crash.jsp
[23:34:27 INFO]: Client> # The crash happened outside the Java Virtual Machine in native code.
[23:34:27 INFO]: Client> # See problematic frame for where to report the bug.
[23:34:27 INFO]: Client> #
[23:34:27 INFO]: Client> AL lib: (EE) alc_cleanup: 1 device not closed
[23:34:27 ERROR]: Game ended with bad state (exit code 1)
[23:34:27 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[23:34:27 INFO]: Deleting C:\Users\KaitlinM\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-2285151835628
[23:34:27 WARN]: Couldn't delete C:\Users\KaitlinM\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-2285151835628 - scheduling for deletion upon exit