Outlook locks up randmonly. I've tried reinstalling the application, to no avail. This system has been running for a long time, but I'd really like to squeeze some more time out of this installation of Windows. Thanks in advance for any assistance.

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Logfile of HijackThis v1.99.1
Scan saved at 10:05:46 AM, on 4/18/2005
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

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\NavNT\defwatch.exe
C:\Program Files\NavNT\rtvscan.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\NavNT\vptray.exe
C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Microsoft Office\Office\FINDFAST.EXE
C:\Program Files\Microsoft Office\Office\OSA.EXE
C:\WINDOWS\system32\userinit.exe
G:\INFORMATION SERVICES\APPLICATIONS\Spyware Protection\HijackThis\hijackthis.exe
C:\WINDOWS\System32\wuauclt.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.com/
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\COMPAN~1\Installs\cpn\ycomp5_5_ 7_0.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: &Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\COMPAN~1\Installs\cpn\ycomp5_5_ 7_0.dll
O4 - HKLM\..\Run: [vptray] C:\Program Files\NavNT\vptray.exe
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - Global Startup: Microsoft Find Fast.lnk = C:\Program Files\Microsoft Office\Office\FINDFAST.EXE
O4 - Global Startup: Office Startup.lnk = C:\Program Files\Microsoft Office\Office\OSA.EXE
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.co...?1102346669838
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = main.DOMAIN.com
O17 - HKLM\Software\..\Telephony: DomainName = main.DOMAIN.com
O17 - HKLM\System\CCS\Services\Tcpip\..\{008B9EE4-7D2D-49A1-9C39-9CC74D65CB65}: NameServer = 192.168.0.240
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = main.DOMAIN.com
O17 - HKLM\System\CS1\Services\Tcpip\..\{008B9EE4-7D2D-49A1-9C39-9CC74D65CB65}: NameServer = 192.168.0.240
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: Domain = main.DOMAIN.com
O17 - HKLM\System\CS2\Services\Tcpip\..\{008B9EE4-7D2D-49A1-9C39-9CC74D65CB65}: NameServer = 192.168.0.240
O20 - Winlogon Notify: NavLogon - C:\WINDOWS\System32\NavLogon.dll
O23 - Service: DefWatch - Symantec Corporation - C:\Program Files\NavNT\defwatch.exe
O23 - Service: Norton AntiVirus Client (Norton AntiVirus Server) - Symantec Corporation - C:\Program Files\NavNT\rtvscan.exe