npm install -g ionic not installing in windows 8.1 - ionic-framework

I'm new to ionic framework and getting error when im trying to install ionic.
I have installed apache-ant, nodejs, cordova but when i was trying to install ionic then it throws error as follows.
OS windows 8.1 64 bit.
Please guide me to install this ionic.
\node-sass\build\binding.sln" (default target) (1) ->
(_src_\libsass target) ->
..\..\src\libsass\include\sass/base.h(18): fatal error C1083: Cannot open inc
lude file: 'stdbool.h': No such file or directory [C:\Users\guru.ramachandran\A
ppData\Roaming\npm\node_modules\ionic\node_modules\node-sass\build\binding.sln]
..\..\src\libsass\include\sass/base.h(18): fatal error C1083: Cannot open inc
lude file: 'stdbool.h': No such file or directory [C:\Users\guru.ramachandran\A
ppData\Roaming\npm\node_modules\ionic\node_modules\node-sass\build\binding.sln]
c:\users\guru.ramachandran\appdata\roaming\npm\node_modules\ionic\node_module
s\node-sass\src\libsass\src\units.hpp(10): error C2668: 'acos' : ambiguous call
to overloaded function [C:\Users\guru.ramachandran\AppData\Roaming\npm\node_mo
dules\ionic\node_modules\node-sass\build\binding.sln]
c:\users\guru.ramachandran\appdata\roaming\npm\node_modules\ionic\node_module
s\node-sass\src\libsass\src\ast.hpp(12): fatal error C1083: Cannot open include
file: 'unordered_map': No such file or directory [C:\Users\guru.ramachandran\A
ppData\Roaming\npm\node_modules\ionic\node_modules\node-sass\build\binding.sln]
c:\users\guru.ramachandran\appdata\roaming\npm\node_modules\ionic\node_module
s\node-sass\src\libsass\src\ast.hpp(12): fatal error C1083: Cannot open include
file: 'unordered_map': No such file or directory [C:\Users\guru.ramachandran\A
ppData\Roaming\npm\node_modules\ionic\node_modules\node-sass\build\binding.sln]
..\..\src\libsass\include\sass/values.h(5): fatal error C1083: Cannot open in
clude file: 'stdbool.h': No such file or directory [C:\Users\guru.ramachandran\
AppData\Roaming\npm\node_modules\ionic\node_modules\node-sass\build\binding.sln

The issue is about node-gyp module, which requires VS2013-VS2015 to build components at this time, in their README file, they say
Option 1
Install all the required tools and configurations using Microsoft's
windows-build-tools using
npm install --global --production windows-build-tools
from an elevated PowerShell or CMD.exe (run as
Administrator).
Option 2
Install tools and configuration manually:
Visual C++ Build Environment:
Option 1: Install Visual C++ Build Tools using the Default Install
option.
Option 2: Install Visual Studio 2015 (or modify an existing
installation) and select Common Tools for Visual C++ during setup.
This also works with the free Community and Express for Desktop
editions.
[Windows Vista / 7 only] requires .NET Framework 4.5.1 Install
Python 2.7 (v3.x.x is not supported), and run npm config set python
python2.7 (or see below for further instructions on specifying the
proper Python version and path.)
Launch cmd, npm config set msvs_version 2015
Source: https://github.com/nodejs/node-gyp

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