遇到兩個問題：
（1）下載NLTK後，無法啟動該程式。計算機提示：“api-ms-win-crt-string-|1-1-0.dl|”:
下載vc_redist.2015.x86和vc_redist.2015.x64進行安裝。
（2）繼續安裝計算機提示“No python installation found in the registry”.解決辦法：新建register.py檔案，將以下程式碼拷貝其中：

#
# script to register Python 2.0 or later for use with win32all
# and other extensions that require Python registry settings
 

#
# written by Joakim Loew for Secret Labs AB / PythonWare
#
# source:
# http://www.pythonware.com/products/works/articles/regpy20.htm
#
# modified by Valentine Gogichashvili as described in http://www.mail-archive.com/[email protected]/msg10512.html

import sys

from _winreg import *

# tweak as necessary
version = sys.version[:3
 
]
installpath = sys.prefix

regpath = "SOFTWARE\\Python\\Pythoncore\\%s\\" % (version)
installkey = "InstallPath"
pythonkey = "PythonPath"
pythonpath = "%s;%s\\Lib\\;%s\\DLLs\\" % (
    installpath, installpath, installpath
)


def RegisterPy():
    try:
        reg = OpenKey(HKEY_CURRENT_USER, regpath)
    except
 
 EnvironmentError as e:
        try:
            reg = CreateKey(HKEY_CURRENT_USER, regpath)
            SetValue(reg, installkey, REG_SZ, installpath)
            SetValue(reg, pythonkey, REG_SZ, pythonpath)
            CloseKey(reg)
        except:
            print "*** Unable to register!"
            return
        print "--- Python", version, "is now registered!"
        return
    if (QueryValue(reg, installkey) == installpath and
                QueryValue(reg, pythonkey) == pythonpath):
        CloseKey(reg)
        print "=== Python", version, "is already registered!"
        return
    CloseKey(reg)
    print "*** Unable to register!"
    print "*** You probably have another Python installation!"


if __name__ == "__main__":
    RegisterPy()

然後在cmd中執行該檔案：python D:register.py
出現Python 2.7 is already registered！則表示配置成功。
再繼續安裝就可以了。