Spyware, viruses, & security : Trojan!

Trojan!

I have a trojan in my computer that's preventing firewalls from running. My antivirus (AVG) constantly sends advice of "Trojan Horse Generic.QGQ" on system32\pptp16.dll, but neither healing or deleting the file is available, cause access is denied. I understand trojans should normally be removed easily using antispyware programs, but I have already tried with Spybot, Windows Defender, Ad-aware and a sort of others and nothing seems to work. Also, I'm not sure if it has to do with this trojan, but my Itunes stopped working and a sort of other programs.

Here´s my hijackthis report. PLEASE HELP!

Logfile of HijackThis v1.99.1
Scan saved at 5:46:25 PM, on 2/25/2006
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\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
C:\WINDOWS\system32\crypserv.exe
C:\Program Files\Alias\Maya7.0\docs\wrapper.exe
C:\Program Files\Dell\NICCONFIGSVC\NICCONFIGSVC.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\ssoftsrv.exe
C:\Program Files\Alias\Maya7.0\docs\jre\bin\java.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Common Files\Ulead Systems\DVD\ULCDRSvr.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\BCMSMMSG.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe
C:\Program Files\CyberLink\PowerDVD\DVDLauncher.exe
C:\Program Files\DAP\DAP.EXE
C:\Program Files\Common Files\Ulead Systems\DVD\USISrv.exe
C:\Program Files\Offline Course Player\OlpSynch.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
C:\Program Files\Mindjet\MindManager 6\MMReminderService.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\Program Files\YourWare Solutions\FreeRAM XP Pro\FreeRAM XP Pro.exe
C:\Program Files\CursorXP\CursorXP.exe
C:\Program Files\Iconoid\iconoid.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Tracker Software\PDF-XChange 3\pdfSaver\pdfSaver3.exe
C:\PROGRA~1\DELLSU~1\DSAgnt.exe
C:\Program Files\InterVideo\Common\Bin\WinCinemaMgr.exe
C:\Program Files\MiniMind\MiniMind.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Adobe\Acrobat 7.0\Reader\AcroRd32.exe
C:\Program Files\Microsoft Office\OFFICE11\POWERPNT.EXE
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\Jose Manuel\My Documents\Downloads\Setups\hijackthis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://r.office.microsoft.com/r/rlidOfficeUpdate?clid=1033
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = proxy.ccm.itesm.mx:8080
O2 - BHO: DAPHelper Class - {0000CC75-ACF3-4cac-A0A9-DD3868E06852} - C:\Program Files\DAP\dapbho.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O2 - BHO: Browster BrwIEConnector - {908A31E8-2A6E-4736-8E8A-AAF00C4AE38F} - C:\Program Files\Browster\Browster.dll
O2 - BHO: CmjBrowserHelperObject Object - {AC41D38F-B56D-40AD-94E0-B493D130C959} - C:\Program Files\Mindjet\MindManager 6\Mm6InternetExplorer.dll
O4 - HKLM\..\Run: [BCMSMMSG] BCMSMMSG.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [DVDLauncher] "C:\Program Files\CyberLink\PowerDVD\DVDLauncher.exe"
O4 - HKLM\..\Run: [DownloadAccelerator] "C:\Program Files\DAP\DAP.EXE" /STARTUP
O4 - HKLM\..\Run: [Ulead Quick-Drop] "C:\Program Files\Ulead Systems\Ulead DVD MovieFactory 4.0 Disc Creator TBYB\Ulead Quick-Drop 1.0\Quick-Drop.exe" WINDOWCALL
O4 - HKLM\..\Run: [USIUDF_Eject_Monitor] C:\Program Files\Common Files\Ulead Systems\DVD\USISrv.exe
O4 - HKLM\..\Run: [OLPSYNCH] C:\Program Files\Offline Course Player\OlpSynch.exe
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
O4 - HKLM\..\Run: [MMReminderService] C:\Program Files\Mindjet\MindManager 6\MMReminderService.exe
O4 - HKLM\..\Run: [Dell QuickSet] C:\Program Files\Dell\QuickSet\quickset.exe
O4 - HKLM\..\Run: [Windows Defender] "C:\Program Files\Windows Defender\MSASCui.exe" -hide
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /installquiet
O4 - HKLM\..\Run: [Zone Labs Client] C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [FreeRAM XP] "C:\Program Files\YourWare Solutions\FreeRAM XP Pro\FreeRAM XP Pro.exe" -win
O4 - HKCU\..\Run: [CursorXP] C:\Program Files\CursorXP\CursorXP.exe
O4 - HKCU\..\Run: [Iconoid] "C:\Program Files\Iconoid\iconoid.exe" -wait 0
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [pdfSaver3] "C:\Program Files\Tracker Software\PDF-XChange 3\pdfSaver\pdfSaver3.exe"
O4 - HKCU\..\Run: [updateMgr] C:\Program Files\Adobe\Acrobat 7.0\Reader\AdobeUpdateManager.exe AcRdB7_0_5 -reboot 1
O4 - HKCU\..\Run: [DellSupport] "C:\PROGRA~1\DELLSU~1\DSAgnt.exe" /startup
O4 - HKCU\..\Run: [Shell] "C:\Program Files\Common Files\Microsoft Shared\Web Folders\ibm00001.exe"
O4 - Startup: Adobe Gamma.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Startup: MiniMinder.lnk = C:\Program Files\MiniMind\MiniMind.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: InterVideo WinCinema Manager.lnk = C:\Program Files\InterVideo\Common\Bin\WinCinemaMgr.exe
O8 - Extra context menu item: &Download with &DAP - C:\Program Files\DAP\dapextie.htm
O8 - Extra context menu item: Browster Prefetch On/Off - res://C:\Program Files\Browster\Browster.dll/CustomPrefetchMenu.htm
O8 - Extra context menu item: Download &all with DAP - C:\Program Files\DAP\dapextie2.htm
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra button: Send to Mindjet MindManager - {531B9DC0-D8EE-4c76-A6EE-6C1E50569655} - C:\Program Files\Mindjet\MindManager 6\Mm6InternetExplorer.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {04E214E5-63AF-4236-83C6-A7ADCBF9BD02} (HouseCall Control) - http://housecall60.trendmicro.com/housecall/xscan60.cab
O16 - DPF: {13EC55CF-D993-475B-9ACA-F4A384957956} - https://www.windowsonecare.com/install/cli/0.8.0794.44/WinSSWebAgent.CAB
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=48835
O16 - DPF: {5ED80217-570B-4DA9-BF44-BE107C0EC166} (Windows Live Safety Center Base Module) - https://scan.safety.live.com/resource/download/scanner/en-us/wlscbase3401.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1136740297859
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1136740289500
O16 - DPF: {E856B973-45FD-4559-8F82-EAB539144667} (AutoFix Launcher Control) - http://pccheckup.dellfix.com/rel/35/install/gtdownde.cab
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O18 - Protocol: talkto - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O20 - Winlogon Notify: pptp16 - C:\WINDOWS\SYSTEM32\pptp16.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: Crypkey License - Kenonic Controls Ltd. - C:\WINDOWS\SYSTEM32\crypserv.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Maya 7.0 Documentation Server (maya70docserver) - Unknown owner - C:\Program Files\Alias\Maya7.0\docs\wrapper.exe" -s "C:\Program Files\Alias\Maya7.0\docs\Wrapper.conf (file missing)
O23 - Service: NICCONFIGSVC - Dell Inc. - C:\Program Files\Dell\NICCONFIGSVC\NICCONFIGSVC.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Cryptainer service (ssoftservice) - Cypherix - C:\WINDOWS\SYSTEM32\ssoftsrv.exe
O23 - Service: Ulead Burning Helper (UleadBurningHelper) - Ulead Systems, Inc. - C:\Program Files\Common Files\Ulead Systems\DVD\ULCDRSvr.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Unknown owner - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

THANK YOU!!