I’m going to try to be as succinct as I possibly can, as I’m at my wit’s end and I have no idea how to fix this problem/problems/issues.  I work from home, so I am my own IT person and without a stable notebook, I’m in real trouble.

I have a Dell Latitude C640, Pentium 4, 200 GHz, 1gb RAM, WinXPPro.

These are the problem(s) I’ve encountered:
(Several months ago) Began with the unit seeming to run very hot and suddenly shutting down with no warning.  Was under warranty at the time and Dell replaced fans, motherboards, screens.  I truly don’t think it helped much, as the unit seemed to still run hot.  But anyway…

(Within the last 10 days) Started shutting down without warning again.  Would ALSO freeze up, to where Con/Alt/Del wouldn’t pull up Task Manager.  Had to force the unit down innumerable TIMES.  Finally, couldn’t even get the unit to boot up – it would shut down before ever booting up completely, even in Safe Mode.  FINALLY got WindowsXP reinstalled.  Got to where it could be booted up, updated Windows completely, started to reinstall my software, including Office2003, iPod, Palm, mostly just the things I use everyday, including ICQ and AIM.  I’m not a gamer or anything like that.  Anyway, often during downloads and updates, the computer would still suddenly shut down.  Also, suddenly no audio device is recognized, as well as I am still unable to sync my Palm or my iPod, as they aren’t recognized as even being plugged into the USB port (this was no problem before these issues started).  However, during this most recent turmoil, I’ve discovered that when booting up, the file svchost.exe SYSTEM is running at 90+ CPU, with Mem Usage up to the 90,000s, and the overall CPU usage is locked at 100%.  I can right-click svchost.exe and choose End Process Tree, if I get Task Manager opened fast enough, which solves the immediate problem, but my taskbar would suddenly change back to some weird looking Win98 type, same with Internet Explorer and most windows I would open after the taskbar change.  I did shut off Automatic Updates in Windows Security Center, but the computer is still sluggish and will freeze periodically, etc.

Here is my HijackThis log:

Logfile of HijackThis v1.99.1
Scan saved at 5:12:49 PM, on 4/4/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16414)

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Nhksrv.exe
C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\PROGRA~1\Grisoft\AVG7\avgcc.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Program Files\Lexmark 7100 Series\lxbxmon.exe
C:\WINDOWS\system32\lxbxcoms.exe
C:\Program Files\Lexmark 7100 Series\ezprint.exe
C:\Program Files\Microsoft Broadband Networking\MSBNTray.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\taskmgr.exe
D:\My Received Files\hijackthis\HijackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search PAGE = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll
O4 - HKLM\..\Run: [SynTPLpr] C:\Program Files\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [AtiPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [Windows Defender] "C:\Program Files\Windows Defender\MSASCui.exe" -hide
O4 - HKLM\..\Run: [LXBXCATS] rundll32 C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\LXBXtime.dll,[email protected]
O4 - HKLM\..\Run: [lxbxmon.exe] "C:\Program Files\Lexmark 7100 Series\lxbxmon.exe"
O4 - HKLM\..\Run: [FaxCenterServer4_in_1] "C:\Program Files\Lexmark 7100 Series\fm3032.exe" /s
O4 - HKLM\..\Run: [EzPrint] "C:\Program Files\Lexmark 7100 Series\ezprint.exe"
O4 - HKCU\..\Run: [TClockEx] C:\Program Files\TClockEx\TCLOCKEX.EXE
O4 - GLOBAL Startup: Microsoft Broadband Networking.lnk = ?
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: ICQ Lite - {B863453A-26C3-4e1f-A54D-A2CD196348E9} - C:\Program Files\ICQLite\ICQLite.exe
O9 - Extra 'Tools' menuitem: ICQ Lite - {B863453A-26C3-4e1f-A54D-A2CD196348E9} - C:\Program Files\ICQLite\ICQLite.exe
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
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
O11 - Options group: [INTERNATIONAL] International*
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1175382911893
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPod Service - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: lxbx_device - Lexmark International, Inc. - C:\WINDOWS\system32\lxbxcoms.exe
O23 - Service: Netropa NHK Server (Nhksrv) - Unknown owner - C:\WINDOWS\Nhksrv.exe

Here is a screen shot of the Tasklist (before turning off Automatic Updates):



Here is the Task Manager (again, before turning off Automatic Updates):



I have downloaded and installed two Microsoft patches that were supposed to address the problems: WindowsXP-KB927891-v2-x86-ENU and WindowsXP-KB921883-x86-ENU.  I ran a scan for a worm CALLED FixWelch.  I would like to have Automatic Updates work, as I’m not the best at staying on top of these things.  I never had a problem with these things, even during the first time the computer was shutting down on its own.  Any help you can give me would be most appreciated, but thanks for looking anyway!