Hello,
I am only a user with little experience. This is why I post may HJlIst here.
Logfile of HijackThis v1.99.1
Scan saved at 17:01:51, on 07.10.2006
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:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\hkcmd.exe
C:\Programme\Gemeinsame Dateien\Real\Update_OB\realsched.exe
C:\Programme\Logitech\Video\LogiTray.exe
C:\Programme\AntiVir PersonalEdition Classic\avgnt.exe
C:\Programme\HP\HP Software Update\HPWuSchd2.exe
C:\Programme\SPAMfighter\SFAgent.exe
C:\Programme\SPYWAREfighter\spftray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programme\AntiVir PersonalEdition Classic\sched.exe
C:\Programme\AntiVir PersonalEdition Classic\avguard.exe
C:\Programme\Gemeinsame Dateien\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\LVComS.exe
C:\Programme\HP\Digital Imaging\bin\hpqtra08.exe
C:\Programme\Freecom Personal Media Suite\FCPMS.exe
C:\Programme\Mozilla Firefox\firefox.exe
C:\Programme\SPYWAREfighter\spfprc.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\Programme\SPYWAREfighter\SPYWAREfighter.exe
C:\Programme\WinZip\WINZIP32.EXE
C:\PROGRA~1\WINZIP\wzqkpick.exe
C:\PROGRA~1\WINZIP\winzip32.exe
C:\PROGRA~1\WINZIP\winzip32.exe
C:\Dokumente und Einstellungen\Martin Kaiser\Lokale Einstellungen\Temp\wz188c\HijackThis.exe
C:\WINDOWS\system32\NOTEPAD.EXE

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.msn.de/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.msn.de/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://search.msn.de/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.msn.de/
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programme\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\system32\hkcmd.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [TkBellExe] "C:\Programme\Gemeinsame Dateien\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [LogitechVideoRepair] C:\Programme\Logitech\Video\ISStart.exe
O4 - HKLM\..\Run: [LogitechVideoTray] C:\Programme\Logitech\Video\LogiTray.exe
O4 - HKLM\..\Run: [avgnt] "C:\Programme\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [HP Software Update] C:\Programme\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [SPAMfighter Agent] "C:\Programme\SPAMfighter\SFAgent.exe" update delay 60
O4 - HKLM\..\Run: [spywarefighterguard] C:\Programme\SPYWAREfighter\spftray.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Startup: Freecom Personal Media Suite.lnk = C:\Programme\Freecom Personal Media Suite\FCPMS.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Programme\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programme\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: WinZip Quick Pick.lnk = C:\Programme\WinZip\WZQKPICK.EXE
O8 - Extra context menu item: Nach Microsoft &Excel exportieren - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: Recherchieren - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programme\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programme\Messenger\msmsgs.exe
O14 - IERESET.INF: START_PAGE_URL=http://www.freenet.de
O17 - HKLM\System\CCS\Services\Tcpip\..\{7F3FC7D0-66DB-4957-971E-BAF415C98583}: NameServer = 192.168.1.1
O20 - AppInit_DLLs: hplun.dll
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: AntiVir PersonalEdition Classic Planer (AntiVirScheduler) - Avira GmbH - C:\Programme\AntiVir PersonalEdition Classic\sched.exe
O23 - Service: AntiVir PersonalEdition Classic Guard (AntiVirService) - AVIRA GmbH - C:\Programme\AntiVir PersonalEdition Classic\avguard.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programme\Gemeinsame Dateien\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Programme\iPod\bin\iPodService.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: SPYWAREfighterRP - SpamFighter APS - C:\Programme\SPYWAREfighter\spfprc.exe

Problems starteted some time ago when MS sent me a message from Windows genuine. After fixing some problems the new version from iTunes could not be installed due to problems with deleting QuickTime. Some programs could not delete it either or manually, erverytime I try to delete it the progress stops immediately.
Would be great if someone could help me !
Greetings