请帮忙!无论上哪个网站,都会出现一个固定的广告,有时浏览某些站点时地址栏会自动更改网址成该广告的网址.网址是http://www.53900.com/ 我试过IE修复,但没用,可恶啊！仍然跳出来。请大虾帮忙看一下,先把日志贴上来。
Logfile of HijackThis v1.99.1
Scan saved at 13:18:26, on 2005-10-23
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\Explorer.EXE
C:\WINDOWS\System32\ctfmon.exe
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\Yahoo!\ASSIST~1\YLive.exe
C:\Program Files\KV2005\KVMonXP.kxp
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
D:\program files\qttask.exe
C:\PROGRA~1\Yahoo!\Assistant\yassistse.exe
C:\Program Files\3721\Dlaccel\YDownloader.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\PROGRA~1\KV2005\KVSrvXP.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\rundll32.exe
C:\Program Files\Internet Explorer\iexplore.exe
D:\Program Files\hijackthis\HijackThis.exe

R3 - URLSearchHook: (no name) - {BB936323-19FA-4521-BA29-ECA6A121BC78} - (no file)
R3 - URLSearchHook: 雅虎助手 - {406F94F0-504F-4a40-8DFD-58B0666ABEBD} - C:\PROGRA~1\Yahoo!\ASSIST~1\Assist\yasbar.dll
O2 - BHO: ThunderIEHelper Class - {0005A87D-D626-4B3A-84F9-1D9571695F55} - C:\WINDOWS\System32\xunleibho_v3.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: 雅虎助手 - {406F94F0-504F-4a40-8DFD-58B0666ABEBD} - C:\PROGRA~1\Yahoo!\ASSIST~1\Assist\yasbar.dll
O2 - BHO: YDragSearch - {62EED7C6-9F02-42f9-B634-98E2899E147B} - C:\PROGRA~1\Yahoo!\ASSIST~1\Assist\YDRAGS~1.DLL
O2 - BHO: MMSAssist - {6671A431-5C3D-463d-A7CF-5587F9B7E191} - C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL
O2 - BHO: stdup - {6A512BF7-EC78-4e8d-9841-6C02E8FA9838} - C:\WINDOWS\system32\stdup.dll
O2 - BHO: BrowseHelper Class - {80BF4637-D65B-43F3-BB60-C5DD3D5FB7B9} - C:\Program Files\KV2005\KvShell_1.dll
O2 - BHO: IeCatch2 Class - {A5366673-E8CA-11D3-9CD9-0090271D075B} - C:\PROGRA~1\FLASHGET\jccatch.dll
O2 - BHO: IE - {D157330A-9EF3-49F8-9A67-4141AC41ADD4} - C:\WINDOWS\downlo~1\CnsHook.dll
O2 - BHO: IEHlprObj Class - {EE7C3CF0-4B15-11D1-ABED-709549C10000} - C:\PROGRA~1\INTERN~1\IEDETE~1.DLL
O3 - Toolbar: 电台(&R) - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: 雅虎助手 - {406F94F0-504F-4a40-8DFD-58B0666ABEBD} - C:\PROGRA~1\Yahoo!\ASSIST~1\Assist\yasbar.dll
O3 - Toolbar: 江民杀毒工具栏 - {B5A34A93-D538-43A7-8371-864CB6148D12} - C:\Program Files\KV2005\KvShell_1.dll
O4 - HKLM\..\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - HKLM\..\Run: [PHIME2002ASync] C:\WINDOWS\System32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\System32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [KvMonXP] "C:\Program Files\KV2005\KVMonXP.kxp" /auto
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
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\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [ADShow] C:\WINDOWS\System32\bcsysnote.ex
O4 - HKLM\..\Run: [QuickTime Task] "D:\program files\qttask.exe" -atboottime
O4 - HKLM\..\Run: [YLive.exe] C:\PROGRA~1\Yahoo!\ASSIST~1\YLive.exe
O4 - HKLM\..\Run: [yassistse] "C:\PROGRA~1\Yahoo!\Assistant\yassistse.exe"
O4 - HKLM\..\Run: [yahoo_mini] C:\Program Files\3721\Dlaccel\YDownloader.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O8 - Extra context menu item:  >> 彩信发送 << - res://C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL/mms.htm
O8 - Extra context menu item: &使用下载加速专家下载 - C:\Program Files\3721\Dlaccel\geturl.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: (no name) - {6671A433-5C3D-463d-A7CF-5587F9B7E191} - C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL
O9 - Extra 'Tools' menuitem: MMSAssist工具条设置 - {6671A433-5C3D-463d-A7CF-5587F9B7E191} - C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
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)
O10 - Unknown file in Winsock LSP: c:\windows\system32\kvwspxp.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\kvwspxp.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\kvwspxp.dll
O11 - Options group: [!CNS]  上网助手-地址栏搜索
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://spaces.msn.com//PhotoUpload/MsnPUpld.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{B833A713-F793-42E2-A135-B3D730D2F1D2}: NameServer = 61.177.7.1 221.228.255.1
O23 - Service: Adobe LM Service - Unknown owner - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: KVSrvXP - JiangMin New Tech Ltd. - C:\PROGRA~1\KV2005\KVSrvXP.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Program Files\Common Files\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe

关于“MMSAssist” 楼主可以先尝试从开始-->设置-->控制面板-->添加删除程序, 卸载

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）
R3 - URLSearchHook: (no name) - {BB936323-19FA-4521-BA29-ECA6A121BC78} - (no file)
O2 - BHO: MMSAssist - {6671A431-5C3D-463d-A7CF-5587F9B7E191} - C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL
O2 - BHO: stdup - {6A512BF7-EC78-4e8d-9841-6C02E8FA9838} - C:\WINDOWS\system32\stdup.dll
O2 - BHO: IEHlprObj Class - {EE7C3CF0-4B15-11D1-ABED-709549C10000} - C:\PROGRA~1\INTERN~1\IEDETE~1.DLL
O4 - HKLM\..\Run: [ADShow] C:\WINDOWS\System32\bcsysnote.exe
O8 - Extra context menu item: >> 彩信发送 << - res://C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL/mms.htm
O9 - Extra button: (no name) - {6671A433-5C3D-463d-A7CF-5587F9B7E191} - C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL
O9 - Extra 'Tools' menuitem: MMSAssist工具条设置 - {6671A433-5C3D-463d-A7CF-5587F9B7E191} - C:\PROGRA~1\MMSASS~1\MMSASS~1.DLL


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：(如果有的话)
C:\WINDOWS\system32\stdup.dll
C:\PROGRA~1\INTERN~1\IEDETE~1.DLL
C:\WINDOWS\System32\bcsysnote.exe
删除文件夹C:\PROGRA~1\MMSASS~1

十分感谢,总算处理掉了,真好!