Help with Hijackthis log file, Please

It seems that I have a trojan that is driving the cpu performance to 100%, changed my hompage to http://v4.windowsupdate.microsoft.com/en/default.asp, is downloading something continuously, creates a host file every time I boot the computer preventing me to access symantec, ca.com and other antivirus sites. It sometimes closes hijackthis before it can save the log file. It also closes NAV corporate edition 7.50.846 before I can use it.
I tried online scans (Panda and Trend Micro) but didn't find anything bad. Same with Spybot and Ad-Aware and CWS hredder.

PLEASE, Help.

Hijackthis log file:

Logfile of HijackThis v1.97.7
Scan saved at 4:21:10 PM, on 4/14/2004
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\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\WINNT\system32\Ati2evxx.exe
C:\Program Files\NavNT\defwatch.exe
C:\WINNT\system32\gearsec.exe
C:\Program Files\NavNT\rtvscan.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\System32\tcpsvcs.exe
C:\WINNT\system32\stisvc.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\System32\mspmspsv.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\MsgSys.EXE
C:\WINNT\Explorer.EXE
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\NavNT\vptray.exe
C:\Program Files\Softex\Winroute\winroute.exe
C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb07.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\WINNT\system32\smssv.exe
C:\WINNT\system32\internat.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\Nikon\NkView6\NkvMon.exe
C:\Program Files\WordWeb\wweb32.exe
C:\Program Files\Dell TrueMobile 1150\Client Manager\CmDEL.exe
C:\Program Files\YahooPOPs\YahooPOPs.exe
C:\Documents and Settings\Federico\My Documents\Software\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://v4.windowsupdate.microsoft.com/
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\system32\msdxm.ocx
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [AtiPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [SynTPLpr] C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [vptray] C:\Program Files\NavNT\vptray.exe
O4 - HKLM\..\Run: [winroute] C:\Program Files\Softex\Winroute\winroute.exe
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb07.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: [Audoi Device Loader] smssv.exe
O4 - HKLM\..\RunServices: [Audoi Device Loader] smssv.exe
O4 - HKCU\..\Run: [internat.exe] internat.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - Startup: YahooPOPs.lnk = C:\Program Files\YahooPOPs\YahooPOPs.exe
O4 - Global Startup: NkvMon.exe.lnk = C:\Program Files\Nikon\NkView6\NkvMon.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: WordWeb.lnk = C:\Program Files\WordWeb\wweb32.exe
O4 - Global Startup: TrueMobile 1150 Client Manager.lnk = C:\Program Files\Dell TrueMobile 1150\Client Manager\CmDEL.exe
O8 - Extra context menu item: &Google Search - res://c:\program files\google\GoogleToolbar2.dll/cmsearch.html
O8 - Extra context menu item: Backward &Links - res://c:\program files\google\GoogleToolbar2.dll/cmbacklinks.html
O8 - Extra context menu item: Cac&hed Snapshot of Page - res://c:\program files\google\GoogleToolbar2.dll/cmcache.html
O8 - Extra context menu item: Si&milar Pages - res://c:\program files\google\GoogleToolbar2.dll/cmsimilar.html
O8 - Extra context menu item: Translate into English - res://c:\program files\google\GoogleToolbar2.dll/cmtrans.html
O16 - DPF: {01A88BB1-1174-41EC-ACCB-963509EAE56B} (SysProWmi Class) - http://support.dell.com/systemprofiler/SysPro.CAB
O16 - DPF: {02BCC737-B171-4746-94C9-0D8A0B2C0089} (Microsoft Office Template and Media Control) - http://office.microsoft.com/templates/ieawsdc.cab
O16 - DPF: {3E68E405-C6DE-49FF-83AE-41EE9F4C36CE} (Office Update Installation Engine) - http://office.microsoft.com/officeupdate/content/opuc.cab
O16 - DPF: {41F17733-B041-4099-A042-B518BB6A408C} - http://a224.g.akamai.net/7/224/52/2...apple.com/qt501/us/win/QuickTimeInstaller.exe
O16 - DPF: {4BEE3896-4820-48D1-85EA-5A9A9ECD3D95} (OPUCatalog Class) - http://office.microsoft.com/productupdates/content/opuc.cab
O16 - DPF: {597C45C2-2D39-11D5-8D53-0050048383FE} (OPUCatalog Class) - http://office.microsoft.com/productupdates/content/opuc.cab
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://a840.g.akamai.net/7/840/537/2004033001/housecall.antivirus.com/housecall/xscan53.cab
O16 - DPF: {90A29DA5-D020-4B18-8660-6689520C7CD7} (DmiReader Class) - http://ftp.us.dell.com/fixes/PROFILER.CAB
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab
O16 - DPF: {9F1C11AA-197B-4942-BA54-47A8489BB47F} (Update Class) - http://v4.windowsupdate.microsoft.com/CAB/x86/unicode/iuctl.CAB?37861.8631597222
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
O16 - DPF: {E855A2D4-987E-4F3B-A51C-64D10A7E2479} (EPSImageControl Class) - http://tools.ebayimg.com/eps/activex/EPSControl_v1-32.cab