启动项中哪些是必须的？

只有ctfmon.exe是输入法，其他都是不必要的

系统托盘、任务栏、桌面图标不在启动项中

CCnsMin.dll，Rundll32是完全可以去掉的第三方插件

3721的东西
可以手动停止
软件除了正常的类注册以及相应的clsid，还有卸载程序的项。由于是activex控件的原因，程序还会建立所以有相应的于ie的activex项。启动加载是在HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run添加项使自己加载，加载方式是用rundll32注册了cnsmin.dll（Rundll32.exe C:\WINDOWS\DOWNLO~1\CnsMin.dll,Rundll32），尽管上面的文件并不太多，可是这些东西自我保护的很厉害比如cnsminkp.sys、cnsmin.dll是无法删除以或是改名的（你可以试试哟。相当好玩的）。所用的机制是：如果你删除或改名3721的话，3721在系统的程序驻留会给系统返回一个删除成功的消息。实际上该文件还在哪里。（这个有别于dllcatch的保护机制，类似于病毒，更占资源），同样的是你也无法对使其加载的注册表项改动。一切都是徒劳的。另外。由于3721已经写进了驱动层（文件CnsMinKP.sys），也就是说即使在安全模式下3721也会加载的。由于这些保护机制的存在，系统大概使用5m左右的内存。这一点也是大家对3721有所诟病原因。

经过上面的分析可以看出，如果你想手工卸掉3721的话，必须早在系统加载驱动前。而这个难度是不小的。但你可以在另外的一个系统下作手术，比如DOS另一个xp，linux。把驱动的文件CnsMinKP.sys以及％WINDOWS％\Downloaded Program Files目录active控件删除。然后删除注册表中HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run下的3721的加载项，以及用关键词3721和cns来搜索到的项目全删除即可。如果没有删除相应的加载的注册表项，进入系统会弹出警告框。说找不到某某模块。

其实也大可不必这么费心，朋友的一些努力使得3721已经完善了他们的卸载程序，早期的卸载程序中会询问你是否保留控件过滤功能，以及保留上网助手的功能。现在的卸载程序只会询问你是否保留那些上网助手的按钮。经过确认。卸载的完整程度相当高。经过卸载以后，软件也没有产生卸不掉的现象。（卸载方法。进入控制面板，添加卸载程序里找到中文实名。然后点击卸载，重启。3721就正常卸载了）

以下是系统启动的时候所有可能加载启动程序的方式，了解它对于解决未知的木马病毒间谍软件等会有好处。

最常见的6个启动文件夹

1. windir\Start Menu\Programs\Startup\
2. User\Startup\
3. All Users\Startup\
4. windir\system\iosubsys\
5. windir\system\vmm32\
6. windir\Tasks\

12个可能的自启动文件位置

1. c:\explorer.exe
2. c:\autoexec.bat
3. c:\config.sys
4. windir\wininit.ini
5. windir\winstart.bat
6. windir\win.ini - [windows] “load”
7. windir\win.ini - [windows] “run”
8. windir\system.ini - [boot] “shell”
9. windir\system.ini - [boot] “scrnsave.exe”
10. windir\dosstart.bat
11. windir\system\autoexec.nt
12. windir\system\config.nt

35个注册表的自启动位置

1. HKEY_LOCAL_MACHINE\Software\Microsoft \Windows\Curr entVersion\Run\
All values in this key are executed.

2. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce\
All values in this key are executed, and then their autostart reference is deleted.

3. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices\
All values in this key are executed as services.

4. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce\
All values in this key are executed as services, and then their autostart reference is deleted.

5. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\
All values in this key are executed.

6. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce\
All values in this key are executed, and then their autostart reference is deleted.

7. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce\Setup\
Used only by Setup. Displays a progress dialog box as the keys are run one at a time.

8. HKEY_USERS\.Default\Software\Microsoft\Windows\CurrentVersion\Run\
Similar to the Run key from HKEY_CURRENT_USER.

9. HKEY_USERS\.Default\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Similar to the RunOnce key from HKEY_CURRENT_USER.

10. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
The “Shell” value is monitored. This value is executed after you log in.

11. HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components\
All subkeys are monitored, with special attention paid to the “StubPath” value in each subkey.

12. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\VxD\
All subkeys are monitored, with special attention paid to the “StaticVXD” value in each subkey.

13. HKEY_CURRENT_USER\Control Panel\Desktop
The “SCRNSAVE.EXE” value is monitored. This value is launched when your screen saver activates.

14. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Contro l\Session Manager
The “BootExecute” value is monitored. Files listed here are Native Applications that are executed before Windows starts.

15. HKEY_CLASSES_ROOT\vbsfile\shell\open\command\
Executed whenever a .VBS file (Visual Basic Script) is run.

16. HKEY_CLASSES_ROOT\vbefile\shell\open\command\
Executed whenever a .VBE file (Encoded Visual Basic Script) is run.

17. HKEY_CLASSES_ROOT\jsfile\shell\open\command\
Executed whenever a .JS file (Javascript) is run.

18. HKEY_CLASSES_ROOT\jsefile\shell\open\command\
Executed whenever a .JSE file (Encoded Javascript) is run.

19. HKEY_CLASSES_ROOT\wshfile\shell\open\command\
Executed whenever a .WSH file (Windows Scripting Host) is run.

20. HKEY_CLASSES_ROOT\wsffile\shell\open\command\
Executed whenever a .WSF file (Windows Scripting File) is run.

21. HKEY_CLASSES_ROOT\exefile\shell\open\command\
Executed whenever a .EXE file (Executable) is run.

22. HKEY_CLASSES_ROOT\comfile\shell\open\command\
Executed whenever a .COM file (Command) is run.

23. HKEY_CLASSES_ROOT\batfile\shell\open\command\
Executed whenever a .BAT file (Batch Command) is run.

24. HKEY_CLASSES_ROOT\scrfile\shell\open\command\
Executed whenever a .SCR file (Screen Saver) is run.

25. HKEY_CLASSES_ROOT\piffile\shell\open\command\
Executed whenever a .PIF file (Portable Interchange Format) is run.

26. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\
Services marked to startup automatically are executed before user login.

27. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock2\Parameters\Protocol_Catalog\Catalog_En tries\
Layered Service Providers, executed before user login.

28. HKEY_LOCAL_MACHINE\System\Control\WOW\cmdline
Executed when a 16-bit Windows executable is executed.

29. HKEY_LOCAL_MACHINE\System\Control\WOW\wowcmdline
Executed when a 16-bit DOS application is executed.

30. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit
Executed when a user logs in.

31. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\ShellServiceObjectDelayLoad\
Executed by explorer.exe as soon as it has loaded.

32. HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows\run
Executed when the user logs in.

33. HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows\load
Executed when the user logs in.

34. HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Policies\Explorer\run\
Subvalues are executed when Explorer initialises.

35. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\Policies\Explorer\run\
Subvalues are executed when Explorer initialises.

1、输入法：ctfmon；

2、NVIDIA显示卡相关动态链接库文件：NvCpl；

3、系统程序，即c盘system的。

建议：
1、不常用的或开机后不一定使用，都能禁止开机启动，否则需要较长时间开机。

2、杀毒软件视情况而定。

同上，一个不要系统可以正常运行