Our computer seems to have contracted some sort of mIRC related Trojan. I've gathered that it's some sort of backdoor thing (even though I did a scan on pcflank.com that said no ports were open). Basically Uninstalling mIRC (which appeared out of nowhere, no one uses it or downloaded it) doesn't work properly, it says some files could not be removed and then on start up the program starts again.
We've also been getting BSOD saying multiple_irp_complete_requests and the only way to get out of them is to turn off the computer at the switch. Would be grateful for help on how to clean the system...

Here's the HijackThis log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 12:34:38, on 24/12/2008
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16762)
Boot mode: Normal

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\ccSvcHst.exe
C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Symantec\LiveUpdate\AluSchedulerSvc.exe
C:\WINDOWS\system32\CTsvcCDA.exe
C:\WINDOWS\system32\inetsrv\inetinfo.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Program Files\Microsoft SQL Server\MSSQL$ASI\Binn\sqlservr.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\igfxtray.exe
C:\WINDOWS\System32\hkcmd.exe
C:\Program Files\Java\j2re1.4.2_03\bin\jusched.exe
C:\WINDOWS\system32\hplampc.exe
C:\Program Files\Common Files\Nokia\NCLTools\NclTray.exe
C:\Program Files\Canon\MyPrinter\BJMyPrt.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
C:\Program Files\Messenger\msmsgs.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Creative\MediaSource\Detector\CTDetect.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNo tifier.exe
C:\Program Files\OLYMPUS\OLYMPUS Master 2\MMonitor.exe
C:\Program Files\FinePixViewer\QuickDCF.exe
C:\Program Files\Psion\PsiWin\Psconsv.exe
C:\PROGRA~1\COMMON~1\Nokia\Services\SERVIC~1.EXE
C:\QUICKENW\QWDLLS.EXE
C:\PROGRA~1\Psion\PsiWin\Elogerr.exe
C:\Program Files\Microsoft SQL Server\80\Tools\Binn\sqlmangr.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\DOCUME~1\ROGERK~1\LOCALS~1\Temp\miunst_.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = Ireland: Warren Farm Guest Self Catering Cottages and apartments to rent: Southern Ireland
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = MSN.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = Live Search
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = Live Search
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = Ireland: Warren Farm Guest Self Catering Cottages and apartments to rent: Southern Ireland
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: NCO 2.0 IE BHO - {602ADB0E-4AFF-4217-8AA1-95DAC4DFA408} - C:\Program Files\Common Files\Symantec Shared\coShared\Browser\2.6\coIEPlg.dll
O2 - BHO: Symantec Intrusion Prevention - {6D53EC84-6AAE-4787-AEEE-F4628F01010C} - C:\PROGRA~1\COMMON~1\SYMANT~1\IDS\IPSBHO.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\3.1.807.1746\sw g.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: Show Norton Toolbar - {7FEBEFE3-6B19-4349-98D2-FFB09D4B49CA} - C:\Program Files\Common Files\Symantec Shared\coShared\Browser\2.6\CoIEPlg.dll
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\j2re1.4.2_03\bin\jusched.exe
O4 - HKLM\..\Run: [USBTA] C:\WINDOWS\System32\usbtapnp.exe
O4 - HKLM\..\Run: [hplampc] C:\WINDOWS\system32\hplampc.exe
O4 - HKLM\..\Run: [Nokia Tray Application] C:\Program Files\Common Files\Nokia\NCLTools\NclTray.exe
O4 - HKLM\..\Run: [REGSHAVE] C:\Program Files\REGSHAVE\REGSHAVE.EXE /AUTORUN
O4 - HKLM\..\Run: [CanonSolutionMenu] C:\Program Files\Canon\SolutionMenu\CNSLMAIN.exe /logon
O4 - HKLM\..\Run: [CanonMyPrinter] C:\Program Files\Canon\MyPrinter\BJMyPrt.exe /logon
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [OM2_Monitor] "C:\Program Files\OLYMPUS\OLYMPUS Master 2\FirstStart.exe" /OM
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Common Files\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [osCheck] "C:\Program Files\Norton 360\osCheck.exe"
O4 - HKLM\..\Run: [spoolsv] "C:\Windows\temp\spool\spoolsv.exe\"
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Creative Detector] "C:\Program Files\Creative\MediaSource\Detector\CTDetect.exe" /R
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNo tifier.exe
O4 - HKCU\..\Run: [OM2_Monitor] "C:\Program Files\OLYMPUS\OLYMPUS Master 2\MMonitor.exe"
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\Run: [Win32 System Spool] spoolsvc.exe (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [Win32 System Spool] spoolsvc.exe (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [Win32 System Spool] spoolsvc.exe (User 'Default user')
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Billminder.lnk = C:\QUICKENW\BILLMIND.EXE
O4 - Global Startup: Exif Launcher.lnk = C:\Program Files\FinePixViewer\QuickDCF.exe
O4 - Global Startup: PsiWin 2.3 Connection Server.lnk = C:\Program Files\Psion\PsiWin\Psconsv.exe
O4 - Global Startup: Quicken Startup.lnk = C:\QUICKENW\QWDLLS.EXE
O4 - Global Startup: Service Manager.lnk = C:\Program Files\Microsoft SQL Server\80\Tools\Binn\sqlmangr.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.2_03\bin\npjpi142_03.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.2_03\bin\npjpi142_03.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {6A344D34-5231-452A-8A57-D064AC9B7862} (Symantec Download Manager) - https://webdl.symantec.com/activex/symdlmgr.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/ge...sh/swflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{EFF069CC-EDE9-4CA9-9269-6F040A2C7E2A}: NameServer = 213.94.190.235 213.94.190.195
O23 - Service: Automatic LiveUpdate Scheduler - Symantec Corporation - C:\Program Files\Symantec\LiveUpdate\AluSchedulerSvc.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: Symantec Lic NetConnect service (CLTNetCnService) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: COM Host (comHost) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\VAScanner\comHost.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: LiveUpdate - Symantec Corporation - C:\Program Files\Symantec\LiveUpdate\LuComServer_3_4.EXE
O23 - Service: LiveUpdate Notice - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: Symantec Core LC - Unknown owner - C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
O24 - Desktop Component 0: (no name) - file:///C:/DOCUME~1/ROGERK~1/LOCALS~1/Temp/msohtml1/01/clip_image002.gif

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