Logfile of HijackThis v1.99.1
Scan saved at 17:50:52, on 2005-9-27
Platform: Windows XP  (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

Running processes:
C:\windows\System32\smss.exe
C:\windows\system32\winlogon.exe
C:\windows\system32\services.exe
C:\windows\system32\lsass.exe
C:\windows\system32\svchost.exe
C:\windows\System32\svchost.exe
C:\windows\system32\spoolsv.exe
C:\windows\Explorer.EXE
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
E:\apple\qttask.exe
C:\Program Files\D-Tools\daemon.exe
C:\windows\system32\rundll32.exe
C:\windows\System32\ctfmon.exe
C:\WINDOWS\System32\DRIVERS\CDANTSRV.EXE
C:\windows\System32\nvsvc32.exe
C:\windows\System32\svchost.exe
C:\windows\System32\wuauclt.exe
C:\Program Files\Tencent\QQ\QQ.exe
C:\Program Files\Tencent\QQ\TIMPlatform.exe
C:\Program Files\Real\RealOne Player\RealPlay.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Tencent\QQ\61468450\MyRecvFiles\HijackThis.exe

R3 - URLSearchHook: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\assist\asbar.dll
O2 - BHO: AssistII - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\assist\asbar.dll
O2 - BHO: YiSou - {EF1D17A9-089F-40cc-8D64-7324CDEBA0DB} - C:\PROGRA~1\YiSou\yisoub.dll
O3 - Toolbar: 电台(&R) - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\assist\asbar.dll
O3 - Toolbar: 一搜工具条 - {115F6E46-FCBC-41ed-B3B5-3BDDD4AAB5E5} - C:\Program Files\YiSou\yisou.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\windows\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [QuickTime Task] "E:\apple\qttask.exe" -atboottime
O4 - HKLM\..\Run: [DAEMON Tools-2052] "C:\Program Files\D-Tools\daemon.exe"  -lang 2052
O4 - HKLM\..\Run: [helper.dll] C:\windows\system32\rundll32.exe C:\PROGRA~1\3721\helper.dll,Rundll32
O4 - HKLM\..\Run: [CnsMin] Rundll32.exe C:\WINDOWS\DOWNLO~1\CnsMin.dll,Rundll32
O4 - HKCU\..\Run: [ctfmon.exe] C:\windows\System32\ctfmon.exe
O4 - HKCU\..\RunServices: [Synchr0nization Manager] C:\WINDOWS\smss.exe
O8 - Extra context menu item: &使用迅雷下载 - E:\Program Files\Thunder\geturl.htm
O8 - Extra context menu item: &使用迅雷下载全部链接 - E:\Program Files\Thunder\getAllurl.htm
O8 - Extra context menu item: 添加到QQ自定义面板 - C:\Program Files\Tencent\QQ\AddPanel.htm
O8 - Extra context menu item: 添加到QQ表情 - C:\Program Files\Tencent\QQ\AddEmotion.htm
O8 - Extra context menu item: 用QQ彩信发送该图片 - C:\Program Files\Tencent\QQ\SendMMS.htm
O9 - Extra button: 手机短信 - {00000000-0000-0001-0001-596BAEDD1289} - http://sms.3721.com/ie/index.htm (file missing)
O9 - Extra button: Yahoo 1G电邮 - {507F9113-CD77-4866-BA92-0E86DA3D0B97} - http://cn.mail.yahoo.com/promo/rd1 (file missing)
O9 - Extra button: 寻宝乐趣多 - {59BC54A2-56B3-44a0-93E5-432D58746E26} - http://hot.3721.com/rd/shop_btn.htm (file missing)
O9 - Extra button: 上网助手 - {5D73EE86-05F1-49ed-B850-E423120EC338} - http://assistant.3721.com/index.htm?fb=Cns (file missing)
O9 - Extra button: 情景聊天 - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - http://cn.rd.yahoo.com/home/messenger/bjk/clientbtn/?http://cn.messenger.yahoo.com/ (file missing)
O9 - Extra button: (no name) - {ECF2E268-F28C-48d2-9AB7-8F69C11CCB71} - http://assistant.3721.com/security1.htm?fb=Cns (file missing)
O9 - Extra 'Tools' menuitem: 修复浏览器 - {ECF2E268-F28C-48d2-9AB7-8F69C11CCB71} - http://assistant.3721.com/security1.htm?fb=Cns (file missing)
O9 - Extra button: (no name) - {FD00D911-7529-4084-9946-A29F1BDF4FE5} - http://assistant.3721.com/clean1.htm?fb=Cns (file missing)
O9 - Extra 'Tools' menuitem: 清理上网记录 - {FD00D911-7529-4084-9946-A29F1BDF4FE5} - http://assistant.3721.com/clean1.htm?fb=Cns (file missing)
O11 - Options group: [!CNS]  网络实名
O12 - Plugin for .wav: C:\Program Files\Internet Explorer\PLUGINS\npqtplugin.dll
O16 - DPF: {73E4740C-08EB-4133-896B-8D0A7C9EE3CD} (AxInputControl Class) - https://mybank.icbc.com.cn/icbc/perbank/AxSafeControls.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{A6EAF212-B644-44D9-BD25-2C0E3597B7BA}: NameServer = 202.99.160.68 211.136.17.107
O23 - Service: C-DillaSrv - C-Dilla Ltd - C:\WINDOWS\System32\DRIVERS\CDANTSRV.EXE
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\windows\System32\nvsvc32.exe

重新启动到安全模式（进入安全模式的方法:重新启动电脑, 开机自动检测完后, 按[F8]键(可以一直按到启动菜单出来为止), 选择安全模式(Safe Mode)进入Windows。）

请关闭所有IE界面，重新使用HijackThis扫描一次，选中下面建议修复的项目，让HijackThis修复，修复前请允许HijackThis保留备份。（如果楼主知道是安全的可以不必勾选）
O4 - HKCU\..\RunServices: [Synchr0nization Manager] C:\WINDOWS\smss.exe

然后打开我的电脑→再点工具→打开文件夹选项→查看→把隐藏受保护的系统文件（推荐）和隐藏已知文件类型的扩展名的勾去掉→再显示所有文件→找到以下文件并删除：
C:\WINDOWS\smss.exe

【回复“飞跃迷离”的帖子】谢谢，问题解决了