上网时经常弹出HTTP://WWW.U4123.COM ,重装系统后又出现,怎么去掉?

试试卡卡上网安全助手的一键修复

不行的话可以扫描一个日志上来看看，还有就是可以使用卡卡的彻底修复功能。

卡卡的彻底修复功能不管用
日志如下：
Logfile of HijackThis v1.98.0
Scan saved at 20:58:50, on 2005-11-10
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

Running processes:
D:\WINNT\System32\smss.exe
D:\WINNT\system32\winlogon.exe
D:\WINNT\system32\services.exe
D:\WINNT\system32\lsass.exe
D:\PROGRAM FILES\RISING\RAV\Ravmond.exe
D:\PROGRAM FILES\RISING\RAV\RavStub.exe
D:\WINNT\system32\svchost.exe
D:\WINNT\system32\spoolsv.exe
D:\WINNT\system32\svchost.exe
D:\WINNT\system32\nvsvc32.exe
D:\PROGRAM FILES\RISING\RAV\CCENTER.EXE
D:\WINNT\system32\MSTask.exe
D:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
D:\WINNT\System32\WBEM\WinMgmt.exe
D:\WINNT\system32\svchost.exe
D:\WINNT\Explorer.EXE
D:\Program Files\Analog Devices\SoundMAX\Smtray.exe
D:\Program Files\rising\Rfw\Rfw.exe
D:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
D:\PROGRA~1\RISING\RAV\RAVMON.EXE
D:\WINNT\system32\rundll32.exe
D:\Program Files\Common Files\Real\Update_OB\realsched.exe
D:\WINNT\system32\internat.exe
D:\Program Files\Internet Explorer\IEXPLORE.EXE
D:\Program Files\WinRAR\WinRAR.exe
D:\DOCUME~1\gao\LOCALS~1\Temp\Rar$EX00.985\HijackThis.exe

R3 - URLSearchHook: (no name) - {BB936323-19FA-4521-BA29-ECA6A121BC78} - (no file)
R3 - URLSearchHook: 雅虎助手 - {406F94F0-504F-4a40-8DFD-58B0666ABEBD} - D:\PROGRA~1\Yahoo!\ASSIST~1\Assist\yasbar.dll
O2 - BHO: IE - {D157330A-9EF3-49F8-9A67-4141AC41ADD4} - D:\WINNT\downlo~1\CnsHook.dll
O3 - Toolbar: @msdxmLC.dll,-1@2052,电台(&R) - {8E718888-423F-11D2-876E-00A0C9082467} - D:\WINNT\system32\msdxm.ocx
O3 - Toolbar: 卡卡上网安全助手 - {DB9ECD4F-FB8F-4311-B3CE-90B976C2707C} - D:\WINNT\system32\kakatool.dll
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [Smapp] D:\Program Files\Analog Devices\SoundMAX\Smtray.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE NvQTwk,NvCplDaemon initialize
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [rfw] D:\Program Files\rising\Rfw\Rfw.exe
O4 - HKLM\..\Run: [RavTimer] D:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
O4 - HKLM\..\Run: [RavMon] D:\PROGRA~1\RISING\RAV\RAVMON.EXE -SYSTEM
O4 - HKLM\..\Run: [CnsMin] Rundll32.exe D:\WINNT\downlo~1\CnsMin.dll,Rundll32
O4 - HKLM\..\Run: [helper.dll] D:\WINNT\system32\rundll32.exe D:\PROGRA~1\3721\helper.dll,Rundll32
O4 - HKLM\..\Run: [TkBellExe] "D:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKCU\..\Run: [Internat.exe] internat.exe
O4 - HKCU\..\Run: [MsnMsgr] "D:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - Global Startup: Microsoft Office.lnk = D:\Program Files\Microsoft Office\Office\OSA9.EXE
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://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 - Extra button: 雅虎助手 - {5D73EE86-05F1-49ed-B850-E423120EC338} - http://cn.zs.yahoo.com/?source=Cns (file missing)
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - D:\WINNT\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - D:\WINNT\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)
O11 - Options group: [!CNS]  网络实名
O17 - HKLM\System\CCS\Services\Tcpip\..\{9ADACC87-F6F2-46D7-8297-F87E1580F22A}: NameServer = 192.168.1.2

还有呢？

你是不是用的局域网？局域网中……其他电脑的病毒也可能跑到你的主机上……

adsl共享上网

我得机子也出现lz所说的情况,清高手指点...

试试超级兔子的IE修复专家.

O18 - Protocol: about - {3050F406-98B5-11CF-BB82-00AA00BDCE0B} - %SystemRoot%\system32\mshtml.dll
O18 - Protocol: cdl - {3DD53D40-7B8B-11D0-B013-00AA0059CE02} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: file - {79EAC9E7-BAF9-11CE-8C82-00AA004BA90B} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: ftp - {79EAC9E3-BAF9-11CE-8C82-00AA004BA90B} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: gopher - {79EAC9E4-BAF9-11CE-8C82-00AA004BA90B} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: http - {79EAC9E2-BAF9-11CE-8C82-00AA004BA90B} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: https - {79EAC9E5-BAF9-11CE-8C82-00AA004BA90B} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: ipp - (no CLSID) - (no file)
O18 - Protocol: its - {9D148291-B9C8-11D0-A4CC-0000F80149F6} - D:\WINNT\system32\itss.dll
O18 - Protocol: javascript - {3050F3B2-98B5-11CF-BB82-00AA00BDCE0B} - %SystemRoot%\system32\mshtml.dll
O18 - Protocol: local - {79EAC9E7-BAF9-11CE-8C82-00AA004BA90B} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: mailto - {3050F3DA-98B5-11CF-BB82-00AA00BDCE0B} - %SystemRoot%\system32\mshtml.dll
O18 - Protocol: mhtml - {05300401-BCBC-11D0-85E3-00C04FD85AB4} - %SystemRoot%\system32\inetcomm.dll
O18 - Protocol: mk - {79EAC9E6-BAF9-11CE-8C82-00AA004BA90B} - D:\WINNT\system32\urlmon.dll
O18 - Protocol: ms-its - {9D148291-B9C8-11D0-A4CC-0000F80149F6} - D:\WINNT\system32\itss.dll
O18 - Protocol: msdaipp - (no CLSID) - (no file)
O18 - Protocol: res - {3050F3BC-98B5-11CF-BB82-00AA00BDCE0B} - %SystemRoot%\system32\mshtml.dll
O18 - Protocol: sysimage - {76E67A63-06E9-11D2-A840-006008059382} - %SystemRoot%\system32\mshtml.dll
O18 - Protocol: vbscript - {3050F3B2-98B5-11CF-BB82-00AA00BDCE0B} - %SystemRoot%\system32\mshtml.dll
O18 - Protocol: vnd.ms.radio - {3DA2AA3B-3D96-11D2-9BD2-204C4F4F5020} - D:\WINNT\system32\msdxm.ocx