我的瑞星2005查出一个病毒，但是无法杀死。就是C:\WINDOWS\system32\obdc16tg.dll
我想删除，它又出来了，本人是电脑盲，这是个什么病毒呀？

我学别人把HijackThis_815汉化版扫描日志 V1.99.1弄下来了：
Logfile of HijackThis v1.99.0
Scan saved at 2:18:24, on 2005-9-17
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\KAV2005\KWatch.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Symantec AntiVirus\DefWatch.exe
C:\KAV2005\KPfwSvc.EXE
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Symantec AntiVirus\Rtvscan.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\SOUNDMAN.EXE
C:\Program Files\jmesoft\hotkey.exe
C:\WINDOWS\vsnpstd3.exe
C:\KAV2005\KAVStart.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\WINDOWS\system32\rundll32.exe
C:\WINDOWS\system32\ctfmon.exe
C:\KAV2005\KavPFW.exe
C:\PROGRA~1\jmesoft\hkload.exe
C:\KAV2005\KMailMon.EXE
C:\KAV2005\KATMain.EXE
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\PROGRA~1\FLASHGET\flashget.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\WinRAR\WinRAR.exe
C:\DOCUME~1\user\LOCALS~1\Temp\Rar$EX01.218\HijackThis.exe

R3 - URLSearchHook: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\Program Files\3721\Assist\asbar.dll
O2 - BHO: KAVIEHelper Class - {1B2F92A1-CDAF-4511-9382-91E3F5CE0880} - C:\Program Files\KOS\KOSIEBar.dll
O2 - BHO: QQBrowserHelperObject Class - {54EBD53A-9BC1-480B-966A-843A333CA162} - C:\Program Files\Tencent\qq\QQIEHelper.dll
O2 - BHO: IeCatch2 Class - {A5366673-E8CA-11D3-9CD9-0090271D075B} - C:\PROGRA~1\FLASHGET\jccatch.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O2 - BHO: AssistII - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\Program Files\3721\Assist\asbar.dll
O2 - BHO: NTIECatcher Class - {C56CB6B0-0D96-11D6-8C65-B2868B609932} - C:\Program Files\Xi\NetTransport 2\NTIEHelper.dll
O2 - BHO: IE - {D157330A-9EF3-49F8-9A67-4141AC41ADD4} - C:\WINDOWS\downlo~1\CnsHook.dll
O2 - BHO: InsIII - {DDDE2452-AF9E-4577-AE6C-465DBCB54D49} - C:\WINDOWS\system32\obdc16tg.dll
O3 - Toolbar: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\Program Files\3721\Assist\asbar.dll
O3 - Toolbar: 金山毒霸安全助手 - {EF72500A-C234-46C4-BF0A-9AA6913DDF34} - C:\Program Files\KOS\KOSIEBar.dll
O4 - HKLM\..\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [jmekey] C:\Program Files\jmesoft\hotkey.exe
O4 - HKLM\..\Run: [snpstd3] C:\WINDOWS\vsnpstd3.exe
O4 - HKLM\..\Run: [KavStart] "C:\KAV2005\KAVStart.exe" -startup
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [imekrmig] C:\IME\IMKR\imekrmig.exe
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 - HKLM\..\RunOnce: [KRepair.COM] C:\KAV2005\KRepair.COM
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [KavPFW] "C:\KAV2005\KavPFW.exe"
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O8 - Extra context menu item: !搜一搜 - res://C:\WINDOWS\downlo~1\CnsMinEx.dll/1003
O8 - Extra context menu item: 使用网际快车下载 - C:\PROGRA~1\FLASHGET\jc_link.htm
O8 - Extra context menu item: 使用网际快车下载全部链接 - C:\PROGRA~1\FLASHGET\jc_all.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?pid=81127_1006 (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: QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - C:\Program Files\Tencent\qq\QQ.EXE
O9 - Extra 'Tools' menuitem: 腾讯QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - C:\Program Files\Tencent\qq\QQ.EXE
O9 - Extra button: FlashGet - {D6E814A0-E0C5-11d4-8D29-0050BA6940E3} - C:\PROGRA~1\FLASHGET\flashget.exe
O9 - Extra 'Tools' menuitem: &FlashGet - {D6E814A0-E0C5-11d4-8D29-0050BA6940E3} - C:\PROGRA~1\FLASHGET\flashget.exe
O9 - Extra button: (no name) - {DEDEB80D-FA35-45d9-9460-4983E5A8AFE6} - C:\Program Files\Tencent\qq\QQIEHelper.dll
O9 - Extra 'Tools' menuitem: QQ炫彩工具条设置 - {DEDEB80D-FA35-45d9-9460-4983E5A8AFE6} - C:\Program Files\Tencent\qq\QQIEHelper.dll
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: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
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]  上网助手-地址栏搜索
O17 - HKLM\System\CCS\Services\Tcpip\..\{977A383A-1183-4DFD-B51B-D36BFD36E9B9}: NameServer = 202.96.128.86 202.96.128.166
O23 - Service: Symantec Event Manager - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
O23 - Service: Symantec AntiVirus Definition Watcher - Symantec Corporation - C:\Program Files\Symantec AntiVirus\DefWatch.exe
O23 - Service: Kingsoft Personal Firewall Service - Kingsoft Corporation - C:\KAV2005\KPfwSvc.EXE
O23 - Service: Kingsoft Antivirus KWatch Service - Kingsoft Corporation - C:\KAV2005\KWatch.EXE
O23 - Service: SAVRoam - symantec - C:\Program Files\Symantec AntiVirus\SavRoam.exe
O23 - Service: Symantec Network Drivers Service - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec AntiVirus - Symantec Corporation - C:\Program Files\Symantec AntiVirus\Rtvscan.exe


请大家帮帮我，非常感谢！！！

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。）

先终止下面的进程（关闭所有窗口，同时按下CTRL+ALT+DELETE，在打开的窗口中选中要终止的进程，然后按下“结束任务”或者“结束进程”，最后关闭该窗口。
C:\WINDOWS\vsnpstd3.exe

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）
O2 - BHO: InsIII - {DDDE2452-AF9E-4577-AE6C-465DBCB54D49} - C:\WINDOWS\system32\obdc16tg.dll
O4 - HKLM\..\Run: [snpstd3] C:\WINDOWS\vsnpstd3.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\system32\obdc16tg.dll
C:\WINDOWS\vsnpstd3.exe