hosts表老是要被改掉。上网助手，什么的工具都试过没有什么用处。甚至删除hosts表，马上又被新建了一个。
以下是我导出的系统信息，请指教！
HijackThis_zww汉化版扫描日志 V1.99.1
保存于 18:48:07, 日期 2005-12-06
操作系统： Windows 2000 SP4 (WinNT 5.00.2195)
浏览器： Internet Explorer v6.00 SP1 (6.00.2800.1106)
当前运行的进程：
C:\WINNT\System32\smss.exe
C:\WINNT\system32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\svchost.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\WINNT\system32\spoolsv.exe
C:\Program Files\Symantec\pcAnywhere\awhost32.exe
C:\Program Files\Symantec AntiVirus\DefWatch.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\System32\llssrv.exe
C:\PROGRA~1\MICROS~3\MSSQL\binn\sqlservr.exe
C:\WINNT\system32\MSTask.exe
C:\Program Files\Symantec AntiVirus\Rtvscan.exe
C:\WINNT\system32\U8SMSSrv.exe
C:\WINNT\system32\ServerNT.EXE
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\Dfssvc.exe
C:\WINNT\System32\inetsrv\inetinfo.exe
C:\WINNT\System32\msdtc.exe
C:\Program Files\Common Files\System\MSSearch\Bin\mssearch.exe
C:\WINNT\system32\AlertService.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\Explorer.EXE
C:\WINNT\system32\UfSvrMgr.exe
C:\Program Files\Microsoft SQL Server\80\Tools\Binn\sqlmangr.exe
C:\WINNT\system32\rundll32.exe
C:\Documents and Settings\Administrator\桌面\prockiller.exe
C:\Program Files\3721\ske\TrojanAssistant.exe
C:\PROGRAM FILES\INTERNET EXPLORER\IEXPLORE.EXE
C:\WINNT\system32\NOTEPAD.EXE
C:\Program Files\WinRAR\WinRAR.exe
C:\Documents and Settings\Administrator\桌面\HijackThis1991zww.exe
O2 - BHO: IE - {D157330A-9EF3-49F8-9A67-4141AC41ADD4} - C:\WINNT\downlo~1\CnsHook.dll
O3 - IE工具栏增项: @msdxmLC.dll,-1@2052,电台(&R) - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\System32\msdxm.ocx
O3 - IE工具栏增项: Freeprod Toolbar - {77FBF9B8-1D37-4FF2-9CED-192D8E3ABA6F} - C:\Program Files\Freeprod Toolbar\freeprod.dll
O3 - IE工具栏增项: 雅虎助手 - {406F94F0-504F-4a40-8DFD-58B0666ABEBD} - C:\PROGRA~1\Yahoo!\ASSIST~1\assist\yasbar.dll
O4 - 启动项HKLM\\Run: [Service Monitor] rem javams64.exe
O4 - 启动项HKLM\\Run: [timessquare] rem C:\windows\timessquare.exe
O4 - 启动项HKLM\\Run: [adtech2006] rem C:\windows\adtech2006.exe
O4 - 启动项HKLM\\Run: [YLive.exe] rem C:\PROGRA~1\Yahoo!\ASSIST~1\YLive.exe
O4 - 启动项HKLM\\Run: [yassistse] rem "C:\PROGRA~1\Yahoo!\Assistant\yassistse.exe"
O4 - 启动项HKLM\\Run: [helper.dll] rem C:\WINNT\system32\rundll32.exe C:\PROGRA~1\3721\helper.dll,Rundll32
O4 - 启动项HKLM\\Run: [CnsMin] rem Rundll32.exe C:\WINNT\downlo~1\CnsMin.dll,Rundll32
O4 - 启动项HKLM\\Run: [ccApp] rem "C:\Program Files\Common Files\Symantec Shared\ccApp.exe"
O4 - 启动项HKLM\\Run: [vptray] rem C:\PROGRA~1\SYMANT~1\VPTray.exe
O4 - 启动项HKLM\\RunServices: [Service Monitor] javams64.exe
O4 - HKCU\..\Run: [Internat.exe] rem internat.exe
O4 - Global Startup: U8管理服务.lnk = C:\WINNT\system32\UfSvrMgr.exe
O4 - Global Startup: 服务管理器.lnk = C:\Program Files\Microsoft SQL Server\80\Tools\Binn\sqlmangr.exe
O8 - IE右键菜单中的新增项目: !搜一搜 - res://C:\WINNT\downlo~1\CnsMinEx.dll/1003
O8 - IE右键菜单中的新增项目: 雅虎搜索 - res://C:\PROGRA~1\Yahoo!\Assistant\Assist\yasbar.dll/246
O9 - 浏览器额外的按钮: 手机短信 - {00000000-0000-0001-0001-596BAEDD1289} - http://sms.3721.com/ie/index.htm (file missing)
O9 - 浏览器额外的按钮: Yahoo 1G电邮 - {507F9113-CD77-4866-BA92-0E86DA3D0B97} - http://cn.mail.yahoo.com/promo/rd1 (file missing)
O9 - 浏览器额外的按钮: 寻宝乐趣多 - {59BC54A2-56B3-44a0-93E5-432D58746E26} - http://adtaobao.allyes.com/main/adfclick?db=adtaobao&bid=138,140,18&cid=816,8,1&sid=5042&show=ignore&url=?allyesPara=816 (file missing)
O9 - 浏览器额外的按钮: 雅虎助手 - {5D73EE86-05F1-49ed-B850-E423120EC338} - http://cn.zs.yahoo.com/?source=Cns (file missing)
O9 - 浏览器额外的按钮: Freeprod Toolbar - {77FBF9B8-1D37-4FF2-9CED-192D8E3ABA6F} - C:\Program Files\Freeprod Toolbar\freeprod.dll
O9 - 浏览器额外的“工具”菜单项: Freeprod Toolbar - {77FBF9B8-1D37-4FF2-9CED-192D8E3ABA6F} - C:\Program Files\Freeprod Toolbar\freeprod.dll
O9 - 浏览器额外的按钮: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINNT\web\related.htm
O9 - 浏览器额外的“工具”菜单项: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINNT\web\related.htm
O9 - 浏览器额外的按钮: 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 - 浏览器额外的按钮: (no name) - {ECF2E268-F28C-48d2-9AB7-8F69C11CCB71} - http://assistant.3721.com/security1.htm?fb=Cns (file missing)
O9 - 浏览器额外的“工具”菜单项: 修复浏览器 - {ECF2E268-F28C-48d2-9AB7-8F69C11CCB71} - http://assistant.3721.com/security1.htm?fb=Cns (file missing)
O9 - 浏览器额外的按钮: (no name) - {FD00D911-7529-4084-9946-A29F1BDF4FE5} - http://assistant.3721.com/clean1.htm?fb=Cns (file missing)
O9 - 浏览器额外的“工具”菜单项: 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] 上网助手-地址栏搜索
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1125043142828
O20 - Winlogon Notify: ModuleUsage - C:\WINNT\system32\fplu0339e.dll
O20 - Winlogon Notify: NavLogon - C:\WINNT\system32\NavLogon.dll
O20 - Winlogon Notify: PCANotify - C:\WINNT\SYSTEM32\PCANotify.dll
O23 - NT 服务: pcAnywhere Host Service (awhost32) - Symantec Corporation - C:\Program Files\Symantec\pcAnywhere\awhost32.exe
O23 - NT 服务: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
O23 - NT 服务: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccPwdSvc.exe
O23 - NT 服务: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
O23 - NT 服务: Symantec AntiVirus Definition Watcher (DefWatch) - Symantec Corporation - C:\Program Files\Symantec AntiVirus\DefWatch.exe
O23 - NT 服务: Logical Disk Manager Administrative Service (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - NT 服务: SAVRoam (SavRoam) - symantec - C:\Program Files\Symantec AntiVirus\SavRoam.exe
O23 - NT 服务: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
O23 - NT 服务: Symantec AntiVirus - Symantec Corporation - C:\Program Files\Symantec AntiVirus\Rtvscan.exe
O23 - NT 服务: UFSoft SMS Platform (U8SmsSrv) - Unknown owner - C:\WINNT\system32\U8SMSSrv.exe
O23 - NT 服务: 用友U8预警调度服务 (UFALERTSERVICE) - Unknown owner - C:\WINNT\system32\AlertService.exe
O23 - NT 服务: U8管理软件 (UFNet) - Unknown owner - C:\WINNT\system32\ServerNT.EXE
