电脑莫名其妙的又中病毒了，该怎样解决？

Logfile of HijackThis v1.99.1
Scan saved at 15:49:17, on 2006-09-22
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\svchost.exe
C:\Program Files\Rising\Rav\CCenter.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Rising\Rav\Ravmond.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Rising\Rav\RavStub.exe
D:\oracle\ora81\bin\dbsnmp.exe
C:\WINDOWS\system32\CAP4RSK.EXE
D:\oracle\ora81\bin\vppdc.exe
C:\WINDOWS\system32\spool\drivers\w32x86\3\CAP4SWK.EXE
D:\oracle\ora81\BIN\TNSLSNR.exe
d:\oracle\ora81\bin\ORACLE.EXE
C:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindService.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Program Files\Rising\Rav\RavTask.exe
C:\Program Files\Rising\Rav\Ravmon.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\iexplore.exe
E:\软件\RAV\反病毒小工具\HijackThis\HijackThis.exe

F2 - REG:system.ini: UserInit=userinit.exe,
O2 - BHO: QQIEHelper - {54EBD53A-9BC1-480B-966A-843A333CA162} - D:\Program Filesa\腾讯QQ\QQIEHelper.dll
O2 - BHO: NTIECatcher Class - {C56CB6B0-0D96-11D6-8C65-B2868B609932} - d:\Program Files\Xi\NetTransport 2\NTIEHelper.dll
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [RavTask] "C:\Program Files\Rising\Rav\RavTask.exe" -system
O4 - HKLM\..\RunOnce: [RavStub] "C:\Program Files\Rising\Rav\ravstub.exe" /RUNONCE
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Global Startup: IE-Bar.lnk = C:\Program Files\Common Files\IE-Bar\iebar.exe
O8 - Extra context menu item: 使用影音传送带下载 - D:\Program Files\Xi\NetTransport 2\NTAddLink.html
O8 - Extra context menu item: 使用影音传送带下载全部链接 - D:\Program Files\Xi\NetTransport 2\NTAddList.html
O9 - Extra button: 浩方对战平台 - {0A155D3C-68E2-4215-A47A-E800A446447A} - D:\浩方对战平台\GameClient.exe
O9 - Extra button: 我爱音乐(iMusic) - {19781910-F110-11d2-BB9E-00C04F795688} - E:\软件\我爱音乐 iMusic V1.2.8.0\iMusic\iMusic\iMusic.exe
O9 - Extra 'Tools' menuitem: 我爱音乐(iMusic) - {19781910-F110-11d2-BB9E-00C04F795688} - E:\软件\我爱音乐 iMusic V1.2.8.0\iMusic\iMusic\iMusic.exe
O9 - Extra button: (no name) - {DEDEB80D-FA35-45d9-9460-4983E5A8AFE6} - D:\Program Filesa\腾讯QQ\QQIEHelper.dll
O9 - Extra 'Tools' menuitem: QQ炫彩工具条设置 - {DEDEB80D-FA35-45d9-9460-4983E5A8AFE6} - D:\Program Filesa\腾讯QQ\QQIEHelper.dll
O14 - IERESET.INF: START_PAGE_URL=http://www.tomatolei.com
O16 - DPF: {87CCFDB0-C4BE-4BC2-A78C-9EAA7CF96667} - http://www.1000n.com/1000np2p/vodupdate_1.0.0.8.cab
O23 - Service: OracleOraHome81Agent - Oracle Corporation - D:\oracle\ora81\bin\dbsnmp.exe
O23 - Service: OracleOraHome81ClientCache - Unknown owner - D:\oracle\ora81\BIN\ONRSD.EXE
O23 - Service: OracleOraHome81DataGatherer - Oracle Corporation - D:\oracle\ora81\bin\vppdc.exe
O23 - Service: OracleOraHome81HTTPServer - Unknown owner - D:\oracle\ora81\Apache\Apache\Apache.exe
O23 - Service: OracleOraHome81PagingServer - Unknown owner - D:\oracle\ora81/bin/pagntsrv.exe
O23 - Service: OracleOraHome81TNSListener - Unknown owner - D:\oracle\ora81\BIN\TNSLSNR.exe
O23 - Service: OracleServiceORCL - Oracle Corporation - d:\oracle\ora81\bin\ORACLE.EXE
O23 - Service: Rising Process Communication Center (RsCCenter) - Beijing Rising Technology Co., Ltd. - 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: StarWind iSCSI Service (StarWindService) - Rocket Division Software - C:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindService.exe