Games : My Minecraft isn't working when I open it

Whenever I open my Minecraft and select 1.8, it opens for about half a second then shows the Minecraft consle and says:

[21:29:32] [Client thread/INFO]: Setting user: Fireflame134
[21:29:32] [Client thread/INFO]: (Session ID is token:56c956214c414640ae3bff5cf64ce41a:4d5adea94acb45a1baffda7c0a74ec85)
[21:29:37] [Client thread/INFO]: LWJGL Version: 2.9.1
[21:29:38] [Client thread/INFO]: Reloading ResourceManager: Default
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000019f7e64d, pid=5376, tid=4352
#
# JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C  [ig7icd64.dll+0x47e64d]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\Joshua\AppData\Roaming\.minecraft\hs_err_pid5376.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Please help me! If anyone know how to fix this, please tell me!