Logfile of HijackThis v1.99.1
Scan saved at 14:24:32, on 05-7-8
Platform: Windows 98 SE (Win9x 4.10.2222A)
MSIE: Internet Explorer v5.00 (5.00.2614.3500)

Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\RUNDLL32.EXE
C:\WINDOWS\SYSTEM\INTERNAT.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\PROGRAM FILES\3721\ASSISTSE.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
C:\PROGRAM FILES\INTERNET EXPLORER\IEXPLORE.EXE
C:\PROGRAM FILES\WINRAR\WINRAR.EXE
C:\WINDOWS\TEMP\RAR$EX09.393\HIJACKTHIS.EXE

O2 - BHO: AssistII - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRAM FILES\3721\ASSIST\ASBAR.DLL
O2 - BHO: NTIECatcher Class - {C56CB6B0-0D96-11D6-8C65-B2868B609932} - F:\RAV17.24\RAV17.24.11\PLUGIN\NETTRANSPORT 2\NTIEHELPER.DLL
O2 - BHO: CInetSvrHelper Class - {68A7F9FA-A202-4D45-AABA-A10DCAC0D899} - C:\WINDOWS\SYSTEM\INETSV~1.DLL
O2 - BHO: YiSou - {EF1D17A9-089F-40cc-8D64-7324CDEBA0DB} - C:\PROGRA~1\YISOU\YISOUB.DLL
O2 - BHO: ThunderIEHelper Class - {0005A87D-D626-4B3A-84F9-1D9571695F55} - C:\WINDOWS\SYSTEM\XUNLEIBHO_V6.DLL
O3 - Toolbar: 电台(&R) - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O3 - Toolbar: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRAM FILES\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: [internat.exe] internat.exe
O4 - HKLM\..\Run: [CnsMin] Rundll32.exe C:\WINDOWS\DOWNLO~1\CNSMIN.DLL,Rundll32
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\Run: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [assistse] "C:\PROGRAM FILES\3721\ASSISTSE.EXE"
O4 - HKLM\..\Run: [sweetbox] rem C:\PROGRAM FILES\SWEETBOX\SweetBox.exe --silent
O4 - HKLM\..\Run: [tkbellexe] rem "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [3721] rem C:\$NtUninstallQ5926809$\3721.bat
O4 - HKLM\..\Run: [dfvsx] rem "F:\RAV17.24\DFVSX\DFVSX.EXE" -Min
O8 - Extra context menu item: !搜一搜 - res://C:\WINDOWS\DOWNLOADED PROGRAM FILES\CnsMinEx.dll/1003
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
O8 - Extra context menu item: 使用影音传送带下载 - F:\Rav17.24\Rav17.24.11\plugin\NetTransport 2\NTAddLink.html
O8 - Extra context menu item: 使用影音传送带下载全部链接 - F:\Rav17.24\Rav17.24.11\plugin\NetTransport 2\NTAddList.html
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: 上网助手 - {5D73EE86-05F1-49ed-B850-E423120EC338} - http://assistant.3721.com/index.htm?fb=Cns (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: Yahoo 1G电邮 - {507F9113-CD77-4866-BA92-0E86DA3D0B97} - http://cn.mail.yahoo.com/promo/rd1 (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: 手机短信 - {00000000-0000-0001-0001-596BAEDD1289} - http://sms.3721.com/ie/index.htm?pid=U_3721home (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)
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)
O11 - Options group: [!CNS]  上网助手-地址栏搜索
O14 - IERESET.INF: SEARCH_PAGE_URL=
O14 - IERESET.INF: START_PAGE_URL=
O16 - DPF: {E4E2F180-CB8B-4DE9-ACBB-DA745D3BA153} (Rising Web Scan Object) - http://download.rising.com.cn/register/pcver/autoupgradepad/Ver2005/OL2005.cab
O16 - DPF: {2354A44B-3CEB-4829-9940-545B03103538} (PowerPlr Control) - http://vod.ruyi.com/plugin/PowerPlr.ocx
O16 - DPF: {C8BD9ACB-F7EC-48E6-BB2F-DAADC6789E9A} (Kingsoft DUBA OnlineScan) - http://211.152.52.102/duba/antiscan/update/OCX/KAVClean.CAB
O17 - HKLM\System\CCS\Services\VxD\MSTCP: NameServer = 202.100.192.68,202.100.199.8

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）
O2 - BHO: CInetSvrHelper Class - {68A7F9FA-A202-4D45-AABA-A10DCAC0D899} - C:\WINDOWS\SYSTEM\INETSV~1.DLL
O4 - HKLM\..\Run: [3721] rem C:\$NtUninstallQ5926809$\3721.bat
O14 - IERESET.INF: SEARCH_PAGE_URL=
O14 - IERESET.INF: START_PAGE_URL=

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。 用WINDOWS的查找功能进行查找并删除：
C:\WINDOWS\SYSTEM\INETSV~1.DLL
C:\$NtUninstallQ5926809$\3721.bat

楼主日志不全.