那是挂马的小窗口，一般很难屏蔽。你可以试下用屏蔽电信互联星空弹出窗口 
 首先把：
REGEDIT4

[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Use Search Asst"="no"
"Search Page"="http://www.baidu.com"
"Search Bar"="http://www.baidu.com/ie"

[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchURL]
""="http://www.baidu.com/keyword/%s"
"provider"="gogl"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Search]
"SearchAssistant"="http://www.baidu.com/ie"

复制并保存为baibu.reg，双击导入这个注册表文件。
在我的电脑里打开C:\windows\system32\drivers\etc\这个目录，里面有个host文件，用开始菜单附件里的记事本打开（先打开记事本然后拖动这个文件到记事本里即可），如果不显示上面的那个目录，请点击资源管理-工具-文件夹选项，在弹出的对话框中点查看，在显示隐藏文件和文件夹，显示系统文件两个选项上打钩。

host文件显示的内容类似这样：

# Copyright ? 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 ***ed on individual
# lines or following the machine name denoted by a ´#´ symbol.
#
# For example:
#

127.0.0.1        localhost

在127.0.0.1这一行后面添加两行：

65.203.233.113   auto.search.msn.com
59.151.21.100    bf.welcome.vnet.cn

保存，OK，现在再试一下，呵呵，重启以后就再也不会被电信弹窗了！