Games : Why does my Minecraft 1.8.3 Keep on crashing?

My Minecraft keeps on crashing why?

Crash report:[14:40:06] [Client thread/INFO]: Setting user: MushyGuyAlex1234 [14:40:06] [Client thread/INFO]: (Session ID is token:711b14ebf907488f894e4fc276dea86a:1a33027623ce4fdea4af5544fe520bd2) [14:40:14] [Client thread/INFO]: LWJGL Version: 2.9.4
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000005c12c09e, pid=4392, tid=6100
#
# 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  [atio6axx.dll+0xa9c09e]
#
# 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\Alex\AppData\Roaming\.minecraft\hs_err_pid4392.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