浏览器经常自动的关闭怎么回事？
扫描日志如下：
HijackThis_815汉化版扫描日志 V1.99.1
保存于      16:32:01, 日期 05-11-8
操作系统：  Windows 98 SE (Win9x 4.10.2222A)
浏览器：    Internet Explorer v6.00 SP1 (6.00.2800.1106)

当前运行的进程：         
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:\RUNDLL32.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\KAV2003\KAVSVC9X.EXE
C:\WINDOWS\TASKMON.EXE
C:\PROGRAM FILES\P4P\P2PSVR.EXE
C:\RUNDLL32.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\PROGRAM FILES\EFFICIENT NETWORKS\ENTERNET 500\APP\ENTERNET.EXE
C:\WINDOWS\SYSTEM\PSTORES.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
D:\QQ\QQ.EXE
C:\PROGRAM FILES\OICQ\TIMPLATFORM.EXE
C:\PROGRAM FILES\COMMON FILES\REAL\UPDATE_OB\REALSCHED.EXE
D:\PROGRAM FILES\TTPLAYER\TTPLAYER.EXE
D:\PROGRAM FILES\EMULE\EMULE.EXE
C:\WINDOWS\DESKTOP\HIJACKTHIS.EXE
C:\WINDOWS\NOTEPAD.EXE
C:\PROGRAM FILES\ACD SYSTEMS\ACDSEE\ACDSEE.EXE
C:\WINDOWS\DESKTOP\PSACE\HIJACKTHIS1991ZWW.EXE

R3 - URLSearchHook: MyURLSearchHook Class - {982CB676-38F0-4D9A-BB72-D9371ABE876E} - C:\PROGRAM FILES\P4P\TOOLBAR.DLL
O2 - BHO: IE - {D157330A-9EF3-49F8-9A67-4141AC41ADD4} - C:\WINDOWS\DOWNLOADED PROGRAM FILES\CNSHOOK.DLL
O2 - BHO: CPub Object - {0CA51D02-7739-43EA-8D9A-1E8AD4327B03} - C:\PROGRAM FILES\P4P\SODAIE.DLL
O2 - BHO: Target Class - {002AF282-E42D-4B51-9F70-F1570C02FAAD} - C:\PROGRAM FILES\NETMETING\TARGET\0.9.0.7\TARGET.DLL
O2 - BHO: BrowserHAP Class - {AEF6F648-78D8-4456-BEE7-5ADE23D209FD} - C:\PROGRAM FILES\HBCLIENT\HAPAST.DLL
O3 - IE工具栏增项: 电台(&R) - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O3 - IE工具栏增项: (no name) - {AB6BEAD2-325B-4729-BB13-DB24509EFA54}? - (no file)
O3 - IE工具栏增项: (no name) - {CAEEE31B-6844-479C-ADAA-73B6D482E782}? - (no file)
O3 - IE工具栏增项: (no name) - {A9BE2902-C447-420A-BB7F-A5DE921E6138}? - (no file)
O3 - IE工具栏增项: (no name) - {56A7DC70-E102-4408-A34A-AE06FEF01586}? - (no file)
O3 - IE工具栏增项: 卡卡安全助手 - {DB9ECD4F-FB8F-4311-B3CE-90B976C2707C} - C:\PROGRAM FILES\RISING\KAKATOOLBAR\KAKATOOL.DLL
O3 - IE工具栏增项: 搜狗直通车 - {DBBB7978-AF21-4EF4-9AD1-B2F4BC75696C} - C:\PROGRAM FILES\P4P\TOOLBAR.DLL
O3 - IE工具栏增项: Alexa - {3CEFF6CD-6F08-4e4d-BCCD-FF7415288C3B} - C:\\WINDOWS\\SYSTEM\\SHDOCVW.DLL
O4 - 启动项HKLM\\Run: [SystemTray] SysTray.Exe
O4 - 启动项HKLM\\Run: [KAVRun] C:\KAV2003\KAVRun.EXE
O4 - 启动项HKLM\\Run: [KAVSvc9X.exe] C:\KAV2003\KAVSvc9X.exe
O4 - 启动项HKLM\\Run: [TaskMonitor] C:\WINDOWS\taskmon.exe
O4 - 启动项HKLM\\Run: [ScanRegistry] C:\WINDOWS\scanregw.exe /autorun
O4 - 启动项HKLM\\Run: [internat.exe] internat.exe
O4 - 启动项HKLM\\Run: [CnsMin] Rundll32.exe C:\WINDOWS\DOWNLO~1\CNSMIN.DLL,Rundll32
O4 - 启动项HKLM\\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - 启动项HKLM\\Run: [P4P Service] C:\PROGRAM FILES\P4P\P2PSVR.EXE
O4 - 启动项HKLM\\Run: [RavTimeXP] \FONTS\VTT.exe
O4 - 启动项HKLM\\Run: [RavTimXP] \Mstray.exe
O4 - 启动项HKLM\\Run: [hbpassport] C:\PROGRA~1\HBClient\hbast.exe
O8 - IE右键菜单中的新增项目: Download All by FlashGet - C:\PROGRAM FILES\FLASHGET\jc_all.htm
O8 - IE右键菜单中的新增项目: Download using FlashGet - C:\PROGRAM FILES\FLASHGET\jc_link.htm
O8 - IE右键菜单中的新增项目: 使用影音传送带下载 - C:\PROGRA~1\XI\NETTRA~1\NTAddLink.html
O8 - IE右键菜单中的新增项目: 使用影音传送带下载全部链接 - C:\PROGRA~1\XI\NETTRA~1\NTAddList.html
O8 - IE右键菜单中的新增项目: 豪杰超级解霸V8实时播放 - C:\Herosoft\HeroV8\MPURLGET.HTM
O8 - IE右键菜单中的新增项目: 添加到QQ自定义面板 - D:\QQ\AddPanel.htm
O8 - IE右键菜单中的新增项目: 添加到QQ表情 - D:\QQ\AddEmotion.htm
O8 - IE右键菜单中的新增项目: 用QQ彩信发送该图片 - D:\QQ\SendMMS.htm
O8 - IE右键菜单中的新增项目: !搜一搜 - res://C:\WINDOWS\DOWNLOADED PROGRAM FILES\CnsMinEx.dll/1003
O8 - IE右键菜单中的新增项目: 使用搜狗直通车下载 - C:\PROGRAM FILES\P4P\dl.htm
O9 - 浏览器额外的按钮: QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - C:\PROGRAM FILES\OICQ\QQ.EXE
O9 - 浏览器额外的“工具”菜单项: 腾讯QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - C:\PROGRAM FILES\OICQ\QQ.EXE
O9 - 浏览器额外的按钮: 豪杰超级解霸V8 - {367E0A21-8601-4986-9C9A-153BF5ACA118}? - C:\Herosoft\HeroV8\STHSDVD.EXE
O9 - 浏览器额外的“工具”菜单项: 豪杰超级解霸V8 - {367E0A21-8601-4986-9C9A-153BF5ACA118}? - C:\Herosoft\HeroV8\STHSDVD.EXE
O9 - 浏览器额外的按钮: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96}? - C:\PROGRAM FILES\YAHOO!\MESSENGER\YPAGER.EXE
O9 - 浏览器额外的“工具”菜单项: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96}? - C:\PROGRAM FILES\YAHOO!\MESSENGER\YPAGER.EXE
O9 - 浏览器额外的按钮: 上网助手 - {5D73EE86-05F1-49ed-B850-E423120EC338}? - http://assistant.3721.com/index.htm?fb=Cns (file missing)
O9 - 浏览器额外的按钮: 寻宝乐趣多 - {59BC54A2-56B3-44a0-93E5-432D58746E26}? - http://hot.3721.com/rd/shop_btn.htm (file missing)
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: (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)
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: 访问瑞星网站 - {FF2DE7A6-ECB1-4CBC-9C0E-D92A9E66E444} - http://www.rising.com.cn (file missing)
O9 - 浏览器额外的按钮: 访问卡卡社区 - {FF2DE7A6-ECB1-4CBC-9C0E-D92A9E66E445} - http://www.ikaka.com (file missing)
O9 - 浏览器额外的按钮: 上网助手 - {5D73EE86-05F1-49ed-B850-E423120EC338} - http://assistant.3721.com/index.htm?fb=Cns (file missing)
O9 - 浏览器额外的按钮: 寻宝乐趣多 - {59BC54A2-56B3-44a0-93E5-432D58746E26} - http://hot.3721.com/rd/shop_btn.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: 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: 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: (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)
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: SoQ - {8F67DCF3-B1DF-4A39-A787-3775784BF737} - http://www.soq.com (file missing)
O11 - Options group: [!CNS]  网络实名
O14 - IERESET.INF: SEARCH_PAGE_URL=
O14 - IERESET.INF: START_PAGE_URL=
O15 - “受信任的站点”中添加项: *.windupdates.com (HKLM)
O15 - “受信任的站点”中添加项: *.searchbarcash.com (HKLM)
O15 - “受信任的站点”中添加项: *.searchmiracle.com (HKLM)
O15 - “受信任的站点”中添加项: *.skoobidoo.com (HKLM)
O15 - “受信任的站点”中添加项: *.my-internet.info (HKLM)
O15 - “受信任的站点”中添加项: *.xxxtoolbar.com (HKLM)
O15 - “受信任的站点”中添加项: *.slotch.com (HKLM)
O15 - “受信任的站点”中添加项: *.flingstone.com (HKLM)
O15 - “受信任的站点”中添加项: *.mt-download.com (HKLM)
O15 - “受信任的站点”中添加项: *.blazefind.com (HKLM)
O15 - “受信任的站点”中添加项: *.clickspring.net (HKLM)
O15 - “受信任的站点”中添加项: *.ysbweb.com (HKLM)
O15 - “受信任的站点”中添加项: *.slotchbar.com (HKLM)
O15 - 添加的受信任的 IP 地址范围: 67.19.178.84
O15 - 添加的受信任的 IP 地址范围: 206.161.125.149
O15 - 添加的受信任的 IP 地址范围: 67.19.178.84 (HKLM)
O15 - 添加的受信任的 IP 地址范围: 206.161.125.149 (HKLM)
O15 - ProtocolDefaults: 'http' protocol is in Trusted Zone, should be Internet Zone
O15 - ProtocolDefaults: 'http' protocol is in Trusted Zone, should be Internet Zone (HKLM)
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - file://C:\Herosoft\HeroV8\DVDSkin\defskin\HTML\swflash.cab
O16 - DPF: {15DDE989-CD45-4561-BF99-D22C0D5C2B74} (IDDTInitObj Class) - http://image2.sina.com.cn/home/ddtsource/ddt.cab
O16 - DPF: {3D8F74EE-8692-4F8F-B8D2-7522E732519E} (WebActivater Control) - http://game.qq.com/QQGame2.cab
O16 - DPF: {E4E2F180-CB8B-4DE9-ACBB-DA745D3BA153} (Rising Web Scan Object) - http://download.rising.com.cn/register/pcver/autoupgradepad/Ver2005/OL2005.cab
O16 - DPF: {98A62E3F-A8C5-4EF0-8A00-C70CF9D18A89} (LoaderCore Class) - http://tb.sogou.com/DLLoader.cab
O16 - DPF: {EF248BC9-F17D-4024-8868-71A5D22C667C} (Hbact.HbactObject) - http://59.36.96.15/download/updatelist/hap111.cab