几大方法让你轻松更换xp登录背景画面(4)

　　◆20、在线更新不能升级的解决方法

　　在C:\WINDOWS\system32\drivers\etc\hosts中最后一行添加207.68.131.21www.download.windowsupdate.com就可以在线升级了。修改后的文件应该是这样的：

　　# Copyright (c) 1993-1999 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:

　　#

　　# 102.54.94.97 rhino.acme.com # source server

　　# 38.25.63.10 x.acme.com # x client host

　　127.0.0.1 localhost

　　207.68.131.21  .download.windowsupdate.com