O17 Hijack - Can't Permanently Delete

Folks, Thanks in advance for your assistance. Have posted the relevant log below, but so far as I can tell the issue here is simply how to get rid of the O17 hijack that's crept into my system. We have a couple of users on the computer and I've tried deleting it (using Hijack This) through both accounts. Hijack This dumps the O17 and keeps it away until the next time I log on to the net – but then it pops right back up again. Any tips on how to get rid of it? Am no IT wizard but I got this far without wrecking the Dell so I'm willing to try something a bit more dramatic if necessary. Apologies if this has been covered in an earlier post; my ISP keeps kicking me off the system so am rushing to get this in. Thanks MHG Logfile of HijackThis v1.99.1 Scan saved at 10:53:58 AM, on 6/26/2006 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:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe C:\WINDOWS\system32\spoolsv.exe c:\program files\common files\logitech\lvmvfm\LVPrcSrv.exe C:\WINDOWS\Nhksrv.exe C:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe C:\WINDOWS\System32\cisvc.exe C:\WINDOWS\System32\CTsvcCDA.EXE C:\Program Files\Norton AntiVirus\navapsvc.exe C:\Program Files\Norton AntiVirus\IWP\NPFMntor.exe C:\WINDOWS\System32\nvsvc32.exe C:\WINDOWS\System32\PAStiSvc.exe C:\WINDOWS\System32\svchost.exe C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe C:\WINDOWS\System32\MsPMSPSv.exe C:\WINDOWS\Explorer.EXE C:\WINDOWS\DELLMMKB.EXE C:\Program Files\Creative\ShareDLL\CtNotify.exe C:\Program Files\Common Files\Symantec Shared\ccApp.exe C:\WINDOWS\system32\devldr32.exe C:\WINDOWS\system32\ElkCtrl.exe C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe C:\WINDOWS\system32\ctfmon.exe C:\Program Files\Common Files\Microsoft Shared\Works Shared\wkcalrem.exe C:\Program Files\Creative\ShareDLL\MediaDet.Exe C:\WINDOWS\system32\lvcomsx.exe C:\Program Files\Outlook Express\msimn.exe C:\Program Files\Netropa\OSD.exe C:\WINDOWS\system32\cidaemon.exe C:\Program Files\Internet Explorer\iexplore.exe C:\Program Files\Internet Explorer\iexplore.exe C:\Program Files\Internet Explorer\iexplore.exe C:\Program Files\Messenger\msmsgs.exe C:\Documents and Settings\MHG\Local Settings\Temp\Temporary Directory 1 for hijackthis[1].zip\HijackThis.exe O17 - HKLM\System\CCS\Services\Tcpip\..\{D6AF9A50-9735-40C1-8302-D0A37FD44C03}: NameServer = 203.220.72.8