try:
    import archook #The module which locates arcgis
    archook.get_arcpy()
    import arcpy
except ImportError:
    # do whatever you do if arcpy isnt there.

C:Program Files (x86)ArcGISDesktop10.2bin64
C:Program Files (x86)ArcGISDesktop10.2arcpy
C:Program Files (x86)ArcGISDesktop10.2ArcToolboxScripts

set "VENV_PATH=C:VirtualEnvsMyArcPyEnv"
set "PYTHON=C:Python27ArcGIS10.3"

mklink /J %VENV_PATH%Libsite-packagesarcpy "C:Program Files (x86)ArcGISDesktop10.3arcpyarcpy"
mklink /J %VENV_PATH%Libsite-packagesnumpy %PYTHON%Libsite-packagesnumpy

mklink /J %VENV_PATH%Libsite-packagesmatplotlib C:Python27ArcGIS10.3Libsite-packagesmatplotlib
mklink /J %VENV_PATH%Libsite-packagesdateutil %PYTHON%Libsite-packagesdateutil
mklink /J %VENV_PATH%Libsite-packagesmpl_toolkits %PYTHON%Libsite-packagesmpl_toolkits

copy %PYTHON%Libsite-packagespyparsing.py  %VENV_PATH%Libsite-packages
copy %PYTHON%Libsite-packagespylab.py %VENV_PATH%site-packages
copy %PYTHON%Libsite-packagesnetcdftime.py %VENV_PATH%Libsite-packages
copy %PYTHON%Libsite-packagesnetCDF4_utils.py %VENV_PATH%Libsite-packages

REM Only one of the following .pth files will exist (dependent on x64 or x32)

copy %PYTHON%Libsite-packagesDesktop10.3.pth %VENV_PATH%Libsite-packages
copy %PYTHON%Libsite-packagesDTBGGP64.pth %VENV_PATH%Libsite-packages