解决此类问题关键是找出相应软件的CLSID键值。只要知道相应的CLSID,屏蔽掉IE的ActiveX调用，也就可以用来屏蔽3721,CNNIC等恼人插件的自动安装。也不用更改安全证书，不会弹出提示窗口，很方便解决。
具体方法:
1.新建记事本文件，复制以下内容，并另存为.reg文件。
REGEDIT4
#B83FC273-3522-4CC6-92EC-75CC86678DA4 /3721
#9A578C98-3C2F-4630-890B-FC04196EF420 /CNNIC
#CF051549-EDE1-40F5-B440-BCD646CF2C25 /POPO
#4EDBBAEA-F509-49F6-94D1-ECEC4BE5B686 /中文邮
#BC207F7D-3E63-4ACA-99B5-FB5F8428200C /Baidu
#9BBC1154-218D-453C-97F6-A06582224D81 /Baidu
#00000566-0000-0010-8000-00AA006D2EA4 /Adodb.Stream 2.7
#4B106874-DD36-11D0-8B44-00A024DD9EFF /Adodb.Stream 2.5
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{B83FC273-3522-4CC6-92EC-75CC86678DA4}]
"Compatibility Flags"=dWord:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{9A578C98-3C2F-4630-890B-FC04196EF420}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{CF051549-EDE1-40F5-B440-BCD646CF2C25}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{4EDBBAEA-F509-49F6-94D1-ECEC4BE5B686}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{BC207F7D-3E63-4ACA-99B5-FB5F8428200C}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{9BBC1154-218D-453C-97F6-A06582224D81}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{00000566-0000-0010-8000-00AA006D2EA4}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{4B106874-DD36-11D0-8B44-00A024DD9EFF}]
"Compatibility Flags"=dword:00000400
2.双击保存的.reg文件，导入注册表。
