Error after hitting play button

Please attach the following file to this ticket:

C:\Users\wayne\AppData\Roaming\.minecraft\hs_err_pid3864.log

You have modified the game to use 4GB of RAM; that amount of RAM is not available on the machine. It is recommended to assign 2GB of RAM to Minecraft.

Set it back to 2GB and still the same problem...

According to your logs, you should try any of these solutions:

#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 335544320 bytes for Failed to commit pages from 655360 of length 81920
# Possible reasons:
#   The system is out of physical RAM or swap space
#   In 32 bit mode, the process size limit was hit
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Use 64 bit Java on a 64 bit OS
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
#  Out of Memory Error (os_windows.cpp:3324), pid=3864, tid=9280
#
# JRE version: Java(TM) SE Runtime Environment (8.0_51-b16) (build 1.8.0_51-b16)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.51-b03 mixed mode windows-amd64 compressed oops)
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#