Log off to a black screen

Whenever I log off an account on my WinXP computer, it logs off to a black screen instead of the welcome screen.

Any help would be much appreciated

Logfile of HijackThis v1.96.4
Scan saved at 4:19:26 PM, on 9/4/2003
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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:\WINDOWS\System32\nvsvc32.exe
C:\Program Files\Kerio\Personal Firewall\persfw.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\sstray.exe
C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb05.exe
C:\Program Files\McAfee\McAfee Shared Components\Instant Updater\RuLaunch.exe
C:\WINDOWS\System32\RUNDLL32.EXE
C:\Program Files\Common Files\Microsoft Shared\Works Shared\wkcalrem.exe
C:\Program Files\Logitech\MouseWare\system\em_exec.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\McAfee\McAfee VirusScan\Avsynmgr.exe
C:\Program Files\McAfee\McAfee VirusScan\VsStat.exe
C:\Program Files\McAfee\McAfee VirusScan\Vshwin32.exe
C:\Program Files\Common Files\Network Associates\McShield\Mcshield.exe
C:\Program Files\McAfee\McAfee VirusScan\Avconsol.exe
C:\WINDOWS\System32\wuauclt.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Documents and Settings\Tom\My Files\Downloads\hijackthis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = 127.0.0.1
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: McAfee VirusScan - {ACB1E670-3217-45C4-A021-6B829A8A27CB} - C:\Program Files\McAfee\McAfee VirusScan\VSCShellExtension.dll
O4 - HKLM\..\Run: [nForce Tray Options] sstray.exe /r
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb05.exe
O4 - HKLM\..\Run: [WorksFUD] C:\Program Files\Microsoft Works\wkfud.exe
O4 - HKLM\..\Run: [Microsoft Works Portfolio] C:\Program Files\Microsoft Works\WksSb.exe /AllUsers
O4 - HKLM\..\Run: [Microsoft Works Update Detection] C:\Program Files\Microsoft Works\WkDetect.exe
O4 - HKCU\..\Run: [McAfee.InstantUpdate.Monitor] "C:\Program Files\McAfee\McAfee Shared Components\Instant Updater\RuLaunch.exe" /STARTMONITOR
O4 - HKCU\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\System32\NVMCTRAY.DLL,NvTaskbarInit
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: Microsoft Works Calendar Reminders.lnk = ?
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Windows Messenger (HKLM)
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab