The problem was 'solved' by using process manager to imobilize qttask.exe so that I could delete the 'ringzstudio' files. I then uninstalled and reinstalled itunes and quicktime. It worked, but one of the mods asked me to post here anyway.
Logfile of HijackThis v1.99.1
Scan saved at 14:13:38, on 05/12/2005
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)
Running processes:
C:\WINNT\System32\smss.exe
C:\WINNT\system32\csrss.exe
C:\WINNT\system32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\ibmpmsvc.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\Program Files\ewido\security suite\ewidoctrl.exe
C:\WINNT\system32\hidserv.exe
C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
C:\Program Files\Network Associates\VirusScan\mcshield.exe
C:\Program Files\Network Associates\VirusScan\vstskmgr.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\PROGRA~1\NETWOR~1\COMMON~1\naPrdMgr.exe
C:\WINNT\system32\TpKmpSVC.exe
C:\Program Files\M-Audio Transit USB\Install\TUSBInst.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\Explorer.EXE
C:\WINNT\system32\tp4serv.exe
C:\WINNT\system32\PRPCUI.exe
C:\PROGRA~1\ThinkPad\UTILIT~1\EzEjMnAp.Exe
C:\PROGRA~1\ThinkPad\PkgMgr\HOTKEY\TPHKMGR.exe
C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE
C:\Program Files\ThinkPad\PkgMgr\HOTKEY\TPONSCR.exe
C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe
C:\Program Files\Common Files\Network Associates\TalkBack\tbmon.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Java\jre1.5.0_05\bin\jusched.exe
C:\WINNT\system32\RunDll32.exe
C:\WINNT\system32\ltmsg.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\WINNT\system32\internat.exe
C:\Program Files\Google\Google Desktop Search\GoogleDesktop.exe
C:\Program Files\Wireless LAN Utility\WlanUtility.exe
C:\Program Files\M-Audio Transit USB\TUSBTask.exe
C:\Program Files\Google\Google Desktop Search\GoogleDesktopIndex.exe
C:\Program Files\Google\Google Desktop Search\GoogleDesktopDisplay.exe
C:\Program Files\Google\Google Desktop Search\GoogleDesktopCrawl.exe
C:\Program Files\Google\Google Desktop Search\GoogleDesktopOE.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\process explorer\procexp.exe
C:\Program Files\Microsoft Office\Office\WINWORD.EXE
C:\WINNT\msagent\AgentSvr.exe
C:\WINNT\system32\RUNDLL32.EXE
C:\WINNT\system32\SNDVOL32.EXE
C:\Program Files\foobar2000\foobar2000.exe
C:\Program Files\HijackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://g.msn.co.uk/0SEENGB/SAOS01
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\system32\msdxm.ocx
O3 - Toolbar: MSN Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Toolbar\01.01.2607.0\msgr.en-us.en-gb\msntb.dll
O4 - HKLM\..\Run: [TrackPointSrv] tp4serv.exe
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [PRPCMonitor] PRPCUI.exe
O4 - HKLM\..\Run: [EZEJMNAP] C:\PROGRA~1\ThinkPad\UTILIT~1\EzEjMnAp.Exe
O4 - HKLM\..\Run: [TPHOTKEY] C:\PROGRA~1\ThinkPad\PkgMgr\HOTKEY\TPHKMGR.exe
O4 - HKLM\..\Run: [ShStatEXE] "C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE" /STANDALONE
O4 - HKLM\..\Run: [McAfeeUpdaterUI] "C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe" /StartedFromRunKey
O4 - HKLM\..\Run: [Network Associates Error Reporting Service] "C:\Program Files\Common Files\Network Associates\TalkBack\tbmon.exe"
O4 - HKLM\..\Run: [THGuard] "C:\Program Files\TrojanHunter 4.2\THGuard.exe"
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_05\bin\jusched.exe
O4 - HKLM\..\Run: [BMMGAG] RunDll32 C:\PROGRA~1\ThinkPad\UTILIT~1\pwrmonit.dll,StartPwrMonitor
O4 - HKLM\..\Run: [BMMLREF] C:\Program Files\ThinkPad\Utilities\BMMLREF.EXE
O4 - HKLM\..\Run: [BMMMONWND] rundll32.exe C:\PROGRA~1\ThinkPad\UTILIT~1\BatInfEx.dll,BMMAutonomicMonitor
O4 - HKLM\..\Run: [BLOG] rundll32.exe C:\PROGRA~1\ThinkPad\UTILIT~1\BatLogEx.DLL,StartBattLog
O4 - HKLM\..\Run: [LTWinModem1] ltmsg.exe 9
O4 - HKLM\..\Run: [TPKMAPHELPER] C:\Program Files\ThinkPad\Utilities\TpKmapAp.exe -helper
O4 - HKLM\..\Run: [TP4EX] tp4ex.exe
O4 - HKCU\..\Run: [internat.exe] internat.exe
O4 - HKCU\..\Run: [Google Desktop Search] "C:\Program Files\Google\Google Desktop Search\GoogleDesktop.exe" /startup
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: Symantec Fax Starter Edition Port.lnk = C:\Program Files\Microsoft Office\Office\1033\OLFSNT40.EXE
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Wireless Lan Utility.lnk = C:\Program Files\Wireless LAN Utility\WlanUtility.exe
O4 - Global Startup: M-Audio Transit USB Control Panel Launcher.lnk = C:\Program Files\M-Audio Transit USB\TUSBTask.exe
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_05\bin\npjpi150_05.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_05\bin\npjpi150_05.dll
O9 - Extra button: Run WinHTTrack - {36ECAF82-3300-8F84-092E-AFF36D6C7040} - C:\Program Files\WinHTTrack\WinHTTrackIEBar.dll
O9 - Extra 'Tools' menuitem: Launch WinHTTrack - {36ECAF82-3300-8F84-092E-AFF36D6C7040} - C:\Program Files\WinHTTrack\WinHTTrackIEBar.dll
O9 - Extra button: Software Installer - {D1A4DEBD-C2EE-449f-B9FB-E8409F9A0BC5} - C:\Program Files\ThinkPad\PkgMgr\\PkgMgr.exe
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.micros...b?1130240893108
O20 - Winlogon Notify: tpfnf2 - C:\WINNT\SYSTEM32\notifyf2.dll
O20 - Winlogon Notify: tphotkey - C:\WINNT\SYSTEM32\tphklock.dll
O23 - Service: Logical Disk Manager Administrative Service (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: ewido security suite control - ewido networks - C:\Program Files\ewido\security suite\ewidoctrl.exe
O23 - Service: ThinkPad PM Service (IBMPMSVC) - Unknown owner - C:\WINNT\system32\ibmpmsvc.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: McAfee Framework Service (McAfeeFramework) - Network Associates, Inc. - C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
O23 - Service: Network Associates McShield (McShield) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\mcshield.exe
O23 - Service: Network Associates Task Manager (McTaskManager) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\vstskmgr.exe
O23 - Service: Intel NCS NetService (NetSvc) - Intel® Corporation - C:\Program Files\Intel\NCS\Sync\NetSvc.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINNT\system32\HPZipm12.exe
O23 - Service: IBM KCU Service (TpKmpSVC) - Unknown owner - C:\WINNT\system32\TpKmpSVC.exe
O23 - Service: Transit USB Installer (Transit USBInstallerService) - Nemesis - C:\Program Files\M-Audio Transit USB\Install\TUSBInst.exe