Help, I've been taken over by SpyFalcon !

Hope you can help me. Below is a (revised) Hijackthis log. Worryingly, this virus even turns the computer off at various unannounced points. Hope this is one you've come across. Many thanks in advance. Mark

Logfile of HijackThis v1.99.1
Scan saved at 22:03:22, on 20/02/2006
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\wltrysvc.exe
C:\WINDOWS\System32\bcmwltry.exe
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\Program Files\ewido\security suite\ewidoctrl.exe
C:\Program Files\Norton AntiVirus\navapsvc.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\mssearchnet.exe
C:\WINDOWS\system32\nvctrl.exe
C:\PROGRA~1\NORTON~1\navapw32.exe
C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Program Files\ABBYY FineReader 5.0 Sprint\CAgent.exe
C:\Program Files\Common Files\PCSuite\DataLayer\DataLayer.exe
C:\Program Files\Nokia\Nokia PC Suite 6\LaunchApplication.exe
C:\WINDOWS\system32\wltray.exe
C:\Program Files\SpyFalcon\SpyFalcon.exe
C:\Program Files\SpyFalcon\SpyFalcon.exe
C:\Program Files\Nokia\Nokia PC Suite 6\PcSync2.exe
C:\Program Files\HiJackThis\HijackThis.exe
C:\Program Files\Common Files\Intuit\QuickBooks\QBUpdate\qbupdate.exe
C:\PROGRA~1\COMMON~1\PCSuite\Services\SERVIC~1.EXE
C:\PROGRA~1\COMMON~1\Nokia\MPAPI\MPAPI3s.exe
C:\WINDOWS\system32\wuauclt.exe

O2 - BHO: HomepageBHO - {4da4616d-7e6e-4fd9-a2d5-b6c535733e22} - C:\WINDOWS\system32\hp9153.tmp
O4 - HKLM\..\Run: [NAV Agent] C:\PROGRA~1\NORTON~1\navapw32.exe
O4 - HKLM\..\Run: [AdaptecDirectCD] "C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe"
O4 - HKLM\..\Run: [PrinTray] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\printray.exe
O4 - HKLM\..\Run: [TkBellExe] C:\Program Files\Common Files\Real\Update_OB\realsched.exe -osboot
O4 - HKLM\..\Run: [ABBYY Community Agent] C:\Program Files\ABBYY FineReader 5.0 Sprint\CAgent.exe
O4 - HKLM\..\Run: [Easy-PrintToolBox] C:\Program Files\Canon\Easy-PrintToolBox\BJPSMAIN.EXE /logon
O4 - HKLM\..\Run: [DataLayer] C:\Program Files\Common Files\PCSuite\DataLayer\DataLayer.exe
O4 - HKLM\..\Run: [PCSuiteTrayApplication] C:\Program Files\Nokia\Nokia PC Suite 6\LaunchApplication.exe -onlytray
O4 - HKLM\..\Run: [THGuard] "C:\Program Files\TrojanHunter 4.2\THGuard.exe"
O4 - HKLM\..\Run: [wltray.exe] C:\WINDOWS\system32\wltray.exe
O4 - HKLM\..\Run: [SpyFalcon] C:\Program Files\SpyFalcon\SpyFalcon.exe /h
O4 - HKCU\..\Run: [PcSync] C:\Program Files\Nokia\Nokia PC Suite 6\PcSync2.exe /NoDialog
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: QuickBooks Update Agent.lnk = C:\Program Files\Common Files\Intuit\QuickBooks\QBUpdate\qbupdate.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Easy-WebPrint Add To Print List - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_AddToList.html
O8 - Extra context menu item: Easy-WebPrint High Speed Print - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_HSPrint.html
O8 - Extra context menu item: Easy-WebPrint Preview - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Preview.html
O8 - Extra context menu item: Easy-WebPrint Print - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Print.html
O16 - DPF: {E06E2E99-0AA1-11D4-ABA6-0060082AA75C} (GpcContainer Class) - https://qbp.webex.com/client/v_intuit/ra/ieatgpc.cab
O18 - Protocol: intu-res - {9CE7D474-16F9-4889-9BB9-53E2008EAE8A} - C:\Program Files\Common Files\Intuit\intu-res.dll
O23 - Service: ewido security suite control - ewido networks - C:\Program Files\ewido\security suite\ewidoctrl.exe
O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - C:\WINDOWS\system32\LEXBCES.EXE
O23 - Service: Norton AntiVirus Auto Protect Service (navapsvc) - Symantec Corporation - C:\Program Files\Norton AntiVirus\navapsvc.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\COMMON~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: PC Tools Spyware Doctor (SDhelper) - Unknown owner - C:\Program Files\Spyware Doctor\sdhelp.exe (file missing)
O23 - Service: Broadcom Wireless LAN Tray Service (wltrysvc) - Unknown owner - C:\WINDOWS\System32\wltrysvc.exe