Windows Explorer keeps closing

I have Windows XP and run up-to-date Norton antivirus at all times. I downloaded some software and and installed it and Norton caught some viruses and said it effectively deleted or quartentined them. However, now my Windows Explorer.exe keeps crashing. I can reboot it in taskmanager, but it is only a few seconds before it crashes again.

I removed all the new software and did a registry clean. I did another virus scan - no viruses found. I've rebooted several times. No luck. I tried to do a system restore, but the program was so big, it maxed out the restore memory setting so I can't restore to before the installation. I'm getting very worried because this is my company computer and I am not supposed to have Admin access, but I do. Really hoping to get this resolved before Monday!

In Event view, I keep having System errors of W32Time when Explorer crashes. "The time provider NtpClient is configured to acquire time from one or more time sources, however none of the sources are currently accessible. No attempt to contact a source will be made for 29 minutes. NtpClient has no source of accurate time. "

Here is my HJT log:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 7:46:40 PM, on 7/19/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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\ibmpmsvc.exe
C:\WINDOWS\System32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\Program Files\Java\jre1.5.0_04\bin\jusched.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\PROGRA~1\SYMANT~1\VPTray.exe
C:\Program Files\Symantec AntiVirus\DefWatch.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\AGRSMMSG.exe
C:\legacy\lotus\notes\ntmulti.exe
C:\WINDOWS\system32\dla\tfswctrl.exe
C:\Program Files\Symantec AntiVirus\SavRoam.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Symantec AntiVirus\Rtvscan.exe
C:\Program Files\UltraVNC\WinVNC.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\WINDOWS\system32\taskmgr.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\mmc.exe
C:\Downloads\HiJackThis.exe

O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {21E116C7-8F86-4DCD-81F0-1A09D121F4BA} - C:\WINDOWS\system32\jkkJawvT.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll
O2 - BHO: (no name) - {B981ADB6-81C9-4085-9E1C-4D4ABDF2F689} - C:\WINDOWS\system32\ljJATNfc.dll
O4 - HKLM\..\Run: [NGClient] C:\Program Files\Symantec\Ghost\ngctw32.exe
O4 - HKLM\..\Run: [CfgDownload] C:\Program Files\IXOS\IXOS-eCONtext\bin\CfgDownload.exe
O4 - HKLM\..\Run: [Client Access Service] "c:\legacy\IBM\Client Access\cwbsvstr.exe"
O4 - HKLM\..\Run: [Client Access Help Update] "c:\legacy\IBM\Client Access\cwbinhlp.exe"
O4 - HKLM\..\Run: [Client Access Check Version] "c:\legacy\IBM\Client Access\cwbckver.exe" LOGIN
O4 - HKLM\..\Run: [Client Access Express Welcome] "c:\legacy\IBM\Client Access\cwbwlwiz.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_04\bin\jusched.exe
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Common Files\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [vptray] C:\PROGRA~1\SYMANT~1\VPTray.exe
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [TP4EX] tp4ex.exe
O4 - HKLM\..\Run: [dla] C:\WINDOWS\system32\dla\tfswctrl.exe
O4 - HKLM\..\Run: [StorageGuard] "C:\Program Files\Common Files\Sonic\Update Manager\sgtray.exe" /r
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: [WinVNC] "C:\Program Files\UltraVNC\WinVNC.exe" -servicehelper
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_04\bin\npjpi150_04.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_04\bin\npjpi150_04.dll
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: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/…b?1123078246553
O16 - DPF: {E7D2588A-7FB5-47DC-8830-832605661009} (Live Collaboration) - https://livewc03.custhelp.com/7560-b440h-tu…l/java/RntX.cab
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = companyname.org
O17 - HKLM\Software\..\Telephony: DomainName = companyname.org
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = companyname.org
O20 - Winlogon Notify: jkkJawvT - C:\WINDOWS\SYSTEM32\jkkJawvT.dll
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\System32\Ati2evxx.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
O23 - Service: Client Access Express Remote Command (Cwbrxd) - IBM Corporation - C:\WINDOWS\CWBRXD.EXE
O23 - Service: Symantec AntiVirus Definition Watcher (DefWatch) - Symantec Corporation - C:\Program Files\Symantec AntiVirus\DefWatch.exe
O23 - Service: IBM PM Service (IBMPMSVC) - Unknown owner - C:\WINDOWS\System32\ibmpmsvc.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Multi-user Cleanup Service - IBM Corp - C:\legacy\lotus\notes\ntmulti.exe
O23 - Service: Symantec Ghost Client Agent (NGClient) - Symantec Corporation - C:\Program Files\Symantec\Ghost\ngctw32.exe
O23 - Service: SAVRoam (SavRoam) - symantec - C:\Program Files\Symantec AntiVirus\SavRoam.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec AntiVirus - Symantec Corporation - C:\Program Files\Symantec AntiVirus\Rtvscan.exe
O23 - Service: VNC Server (winvnc) - UltraVNC - C:\Program Files\UltraVNC\WinVNC.exe

PLEASE HELP! Thank you!