I thought first of the firewall and proxy servers, but other people and other machines don't exhibit the behaviour.
Logfile of HijackThis v1.98.2
Scan saved at 9:45:05 AM, on 10/22/2004
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:\Program Files\Network Associates\Alert Manager\amgrsrvc.exe
C:\WINDOWS\MS\SMS\CORE\BIN\CLISVCL.EXE
C:\Program Files\Executive Software\Diskeeper\DkService.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:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\EPOAgent\naimas32.exe
C:\WINDOWS\MS\SMS\CLICOMP\RemCtrl\Wuser32.exe
C:\WINDOWS\MS\SMS\clicomp\apa\Bin\smsapm32.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Viewer\LFprinttomail\lfsndmng.exe
C:\EPOAgent\naimag32.exe
C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE
C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe
C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\QuickTime\qttask.exe
C:\WINDOWS\MS\SMS\CORE\BIN\LAUNCH32.EXE
C:\Program Files\iPod\bin\iPodService.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Interwise\Student\pull.exe
C:\Program Files\Palm\HOTSYNC.EXE
C:\WINDOWS\MS\SMS\CLICOMP\SWDist32\bin\smsmon32.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
C:\Program Files\Internet Explorer\iexplore.exe
H:\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page =
http://
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,AutoConfigURL =
http://proxyconf.xxxxx.com
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer =
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [lfsndmngav] C:\Program Files\Viewer\LFprinttomail\lfsndmng.exe
O4 - HKLM\..\Run: [WebCensus] C:\PROGRA~1\Webcensus\WCClient.exe -dest C:\PROGRA~1\Webcensus
O4 - HKLM\..\Run: [PLUSDNSOff] C:\plus\SetDNSOff.exe
O4 - HKLM\..\Run: [NaimAgent_UI] C:\EPOAgent\naimag32.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: [AdaptecDirectCD] "C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.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: [SMS Application Launcher] C:\WINDOWS\MS\SMS\CORE\BIN\LAUNCH32.EXE
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - Startup: HotSync Manager.lnk = C:\Program Files\Palm\HOTSYNC.EXE
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: Push Client.LNK = C:\Interwise\Student\pull.exe
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: &Google Search -
res://c:\program files\google\GoogleToolbar1.dll/cmsearch.html
O8 - Extra context menu item: Backward Links -
res://c:\program files\google\GoogleToolbar1.dll/cmbacklinks.html
O8 - Extra context menu item: Cached Snapshot of Page -
res://c:\program files\google\GoogleToolbar1.dll/cmcache.html
O8 - Extra context menu item: E&xport to Microsoft Excel -
res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Similar Pages -
res://c:\program files\google\GoogleToolbar1.dll/cmsimilar.html
O8 - Extra context menu item: Translate into English -
res://c:\program files\google\GoogleToolbar1.dll/cmtrans.html
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: @C:\Program Files\Messenger\Msgslang.dll,-61144 - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: @C:\Program Files\Messenger\Msgslang.dll,-61144 - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {8D83D301-E841-11D1-B155-00600823BCF9} (WebLine Browser Integration Classes) -
http://uswebcollab.itrc.hp.com/webline/applets/msie40x.cab
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain =
O17 - HKLM\Software\..\Telephony: DomainName =
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain =
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: SearchList =
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: Domain =
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: SearchList =
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: SearchList =