最近电脑反应比较慢，而且在开机静置状态下总能不时听到打开文件夹的嗒嗒声，这是怎么回事，是病毒吗？还是什么后门程序？我用升级到最新版本的瑞星扫描没有发现任何问题。请指教，万分感谢

Logfile of HijackThis v1.99.1
Scan saved at 21:03:24, on 2005-8-16
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\S24EvMon.exe
C:\WINDOWS\system32\Ati2evxx.exe
c:\program files\rising\rfw\rfwsrv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Apoint\Apoint.exe
C:\Program Files\rising\Rfw\rfwmain.exe
C:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
D:\Program Files\Microsoft AntiSpyware\gcasServ.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Program Files\Dell\QuickSet\Quickset.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Apoint\Apntex.exe
C:\WINDOWS\system32\conime.exe
D:\Program Files\Microsoft AntiSpyware\gcasDtServ.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\System32\RegSrvc.exe
C:\PROGRAM FILES\RISING\RAV\CCENTER.EXE
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Common Files\Ulead Systems\DVD\ULCDRSvr.exe
D:\Program Files\PP\Poco2004.exe
D:\Program Files\PP\PExplorer.dll
D:\Program Files\Tencent\qq\QQ.exe
D:\Program Files\Netease\popo2004\popo.exe
D:\Program Files\Tencent\qq\TIMPlatform.exe
C:\PROGRAM FILES\RISING\RAV\Ravmond.exe
C:\PROGRAM FILES\RISING\RAV\RavStub.exe
c:\program files\rising\rav\RAVMON.EXE
C:\Program Files\Internet Explorer\iexplore.exe
D:\Downloads\杀毒软件防火墙\HijackThis\HijackThis.exe

R3 - Default URLSearchHook is missing
O2 - BHO: MiniTuoTu.SaveTarget - {0E7505F8-8F30-41E0-9D1E-D9DEABD36D38} - C:\Program Files\MiniTuoTu\MiniTuoTu.dll (file missing)
O3 - Toolbar: 一搜工具条 - {115F6E46-FCBC-41ed-B3B5-3BDDD4AAB5E5} - C:\Program Files\YiSou\yisou.dll (file missing)
O3 - Toolbar: (no name) - {DB9ECD4F-FB8F-4311-B3CE-90B976C2707C} - (no file)
O3 - Toolbar: 完美网译通 - {F43BD772-ABDD-43b7-A96A-3E9E61946EC0} - C:\WINDOWS\WORLD2\TOOLBAR\hmtoolbar.dll
O4 - HKLM\..\Run: [Apoint] C:\Program Files\Apoint\Apoint.exe
O4 - HKLM\..\Run: [RfwMain] "C:\Program Files\rising\Rfw\rfwmain.exe" -Startup
O4 - HKLM\..\Run: [RavMon] C:\PROGRA~1\RISING\RAV\RAVMON.EXE -SYSTEM
O4 - HKLM\..\Run: [RavTimer] C:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [gcasServ] "D:\Program Files\Microsoft AntiSpyware\gcasServ.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [Dell QuickSet] C:\Program Files\Dell\QuickSet\Quickset.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O8 - Extra context menu item: !搜一搜(&S) - res://C:\Program Files\YiSou\yisou.dll/232
O8 - Extra context menu item: &使用迅雷下载 - D:\Program Files\Thunder Network\Thunder\geturl.htm
O8 - Extra context menu item: &使用迅雷下载全部链接 - D:\Program Files\Thunder Network\Thunder\getAllurl.htm
O8 - Extra context menu item: 使用Kugoo下载 - D:\Program Files\KuGoo2\KugooDownX.htm
O8 - Extra context menu item: 使用搜狗直通车下载 - C:\PROGRA~1\P4P\dl.htm
O8 - Extra context menu item: 加入POCO网摘(&K) - http://my.poco.cn/fav/rightClick.php
O8 - Extra context menu item: 我的POCO网摘(&O) - http://my.poco.cn/fav/open_myfav.php
O8 - Extra context menu item: 添加到QQ自定义面板 - D:\Program Files\Tencent\qq\AddPanel.htm
O8 - Extra context menu item: 添加到QQ表情 - D:\Program Files\Tencent\qq\AddEmotion.htm
O8 - Extra context menu item: 用QQ彩信发送该图片 - D:\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 (file missing)
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.1_01\bin\npjpi141_01.dll
O9 - Extra 'Tools' menuitem: Sun Java 控制台 - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.1_01\bin\npjpi141_01.dll
O9 - Extra button: 商机直通车 - {13b0c05c-ef05-4bf6-b0ea-f6111af25544} - C:\WINDOWS\system32\alitb\bar.dll
O9 - Extra button: 寻宝乐趣多 - {507F9113-CD77-4866-BA92-0E86DA3D0B97} - http://rd.3721.com/taobao.rd?http://adtaobao.allyes.com/main/adfclick?db=adtaobao&bid=138,140,18&cid=816,8,1&sid=5042&show=ignore&url=http://www.taobao.com/buy1.php (file missing)
O9 - Extra button: 信息检索 - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - D:\PROGRA~1\MICROS~1\OFFICE11\REFIEBAR.DLL
O9 - Extra button: 易趣购物 - {BE9C13C3-9E46-4db1-BC05-BD8DA44599F2} - http://adfarm.mediaplex.com/ad/ck/4080-23171-9517-195?cn=song;icon;hp&mpro=http://www.ebay.com.cn (file missing)
O9 - Extra 'Tools' menuitem: 易趣购物 - {BE9C13C3-9E46-4db1-BC05-BD8DA44599F2} - http://adfarm.mediaplex.com/ad/ck/4080-23171-9517-195?cn=song;icon;hp&mpro=http://www.ebay.com.cn (file missing)
O9 - Extra button: QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - D:\Program Files\Tencent\qq\QQ.EXE
O9 - Extra 'Tools' menuitem: 腾讯QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - D:\Program Files\Tencent\qq\QQ.EXE
O9 - Extra button: 易趣购物 - {DE607143-AC19-423e-864A-4D70ABDF119A} - http://click2.ad4all.net/url2/urlmanage/url.asp?id=5 (file missing)
O9 - Extra 'Tools' menuitem: 易趣购物 - {DE607143-AC19-423e-864A-4D70ABDF119A} - http://click2.ad4all.net/url2/urlmanage/url.asp?id=5 (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)
O12 - Plugin for .mp3: C:\Program Files\Internet Explorer\PLUGINS\npqtplugin3.dll
O17 - HKLM\System\CCS\Services\Tcpip\..\{A38224D0-3F28-4B75-8569-3A4788FA2F62}: NameServer = 219.150.32.132,202.97.224.69
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Program Files\Common Files\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: Intel NCS NetService (NetSvc) - Intel(R) Corporation - C:\Program Files\Intel\NCS\Sync\NetSvc.exe
O23 - Service: RegSrvc - Intel Corporation - C:\WINDOWS\System32\RegSrvc.exe
O23 - Service: Rising Personal Firewall Service (RfwService) - Beijing Rising Technology Corporation Limited - c:\program files\rising\rfw\rfwsrv.exe
O23 - Service: Rising Process Communication Center (RsCCenter) - rising - C:\PROGRAM FILES\RISING\RAV\CCENTER.EXE
O23 - Service: RsRavMon Service (RsRavMon) - Beijing Rising Technology Co., Ltd. - C:\PROGRAM FILES\RISING\RAV\Ravmond.exe
O23 - Service: Spectrum24 Event Monitor (S24EventMonitor) - Intel Corporation  - C:\WINDOWS\System32\S24EvMon.exe
O23 - Service: Ulead Burning Helper (UleadBurningHelper) - Ulead Systems, Inc. - C:\Program Files\Common Files\Ulead Systems\DVD\ULCDRSvr.exe