>>160070
"C:\Windows\System32\drivers\etc\hosts"を見てみましたが中身は空（コメントアウトがあるのみ）でした

># Copyright (c) 1993-2009 Microsoft Corp.
>#
># This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
>#
># This file contains the mappings of IP addresses to host names. Each
># entry should be kept on an individual line. The IP address should
># be placed in the first column followed by the corresponding host name.
># The IP address and the host name should be separated by at least one
># space.
>#
># Additionally, comments (such as these) may be inserted on individual
># lines or following the machine name denoted by a '#' symbol.
>#
># For example: