I'm getting a message that <windows Roor> \system32\hal.dll. is missing. How do I replace this file. Here Logfile of HijackThis v1.98.2
Scan saved at 11:05:43 AM, on 12/1/2004
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\System32\ibmpmsvc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\COMMON~1\AOL\ACS\acsd.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\Program Files\Norton AntiVirus\navapsvc.exe
C:\WINDOWS\System32\QCONSVC.EXE
C:\WINDOWS\wanmpsvc.exe
C:\PROGRA~1\xpoint\xpadmin\xpadmin.exe
C:\PROGRA~1\xpoint\agent\Xpagent.exe
C:\PROGRA~1\xpoint\EEClient\xpclient.exe
C:\WINDOWS\system32\cmd.exe
C:\PROGRA~1\xpoint\SAS\jre\bin\javaw.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\wscntfy.exe
C:\WINDOWS\System32\msdtc.exe
C:\WINDOWS\system32\tp4serv.exe
C:\WINDOWS\AGRSMMSG.exe
C:\WINDOWS\System32\igfxtray.exe
C:\WINDOWS\System32\hkcmd.exe
C:\PROGRA~1\ThinkPad\PkgMgr\HOTKEY\TPHKMGR.exe
C:\WINDOWS\system32\RunDll32.exe
C:\Program Files\ThinkPad\ConnectUtilities\QCWLICON.EXE
C:\Program Files\ThinkPad\Utilities\TpKmapMn.exe
C:\Program Files\ThinkPad\PkgMgr\HOTKEY\TPONSCR.exe
C:\Program Files\ThinkPad\PkgMgr\HOTKEY_1\TpScrex.exe
C:\PROGRA~1\ThinkPad\UTILIT~1\EzEjMnAp.Exe
C:\Program Files\IBM\Messages By IBM\ibmmessages.exe
C:\WINDOWS\system32\dla\tfswctrl.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Real\RealPlayer\RealPlay.exe
C:\PROGRA~1\xpoint\pe\PCRECSA.EXE
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe
C:\Program Files\America Online 7.0m\aoltray.exe
C:\Program Files\Common Files\Symantec Shared\ccPwdSvc.exe
C:\WINDOWS\REGEDIT.EXE
C:\Program Files\America Online 9.0\waol.exe
C:\Program Files\America Online 9.0\shellmon.exe
C:\Program Files\America Online 9.0\aolwbspd.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Documents and Settings\Bob\Desktop\hijackthis.exe

R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://windowsupdate.microsoft.com/
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Program Files\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Program Files\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: AOL Toolbar - {4982D40A-C53B-4615-B15B-B5B5E98D167C} - C:\Program Files\AOL Toolbar\toolbar.dll
O4 - HKLM\..\Run: [S3TRAY2] S3Tray2.exe
O4 - HKLM\..\Run: [TrackPointSrv] tp4serv.exe
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe irprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [TPHOTKEY] C:\PROGRA~1\ThinkPad\PkgMgr\HOTKEY\TPHKMGR.exe
O4 - HKLM\..\Run: [BMMGAG] RunDll32 C:\PROGRA~1\ThinkPad\UTILIT~1\pwrmonit.dll,StartPw rMonitor
O4 - HKLM\..\Run: [BMMLREF] C:\Program Files\ThinkPad\Utilities\BMMLREF.EXE
O4 - HKLM\..\Run: [QCWLICON] C:\Program Files\ThinkPad\ConnectUtilities\QCWLICON.EXE
O4 - HKLM\..\Run: [TPKMAPMN] C:\Program Files\ThinkPad\Utilities\TpKmapMn.exe
O4 - HKLM\..\Run: [TP4EX] tp4ex.exe
O4 - HKLM\..\Run: [EZEJMNAP] C:\PROGRA~1\ThinkPad\UTILIT~1\EzEjMnAp.Exe
O4 - HKLM\..\Run: [ibmmessages] C:\Program Files\IBM\Messages By IBM\ibmmessages.exe
O4 - HKLM\..\Run: [StorageGuard] "c:\Program Files\Common Files\Sonic\Update Manager\sgtray.exe" /r
O4 - HKLM\..\Run: [dla] C:\WINDOWS\system32\dla\tfswctrl.exe
O4 - HKLM\..\Run: [ccApp] C:\Program Files\Common Files\Symantec Shared\ccApp.exe
O4 - HKLM\..\Run: [ccRegVfy] C:\Program Files\Common Files\Symantec Shared\ccRegVfy.exe
O4 - HKLM\..\Run: [ConMgr.exe] "C:\Program Files\EarthLink 5.0\ConMgr.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [RealTray] C:\Program Files\Real\RealPlayer\RealPlay.exe SYSTEMBOOTHIDEPLAYER
O4 - HKLM\..\Run: [PCRecSA] C:\PROGRA~1\xpoint\pe\PCRECSA.EXE -noshow
O4 - HKCU\..\Run: [ibmmessages] C:\Program Files\IBM\Messages By IBM\ibmmessages.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [SpySweeper] "C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe" /0
O4 - Global Startup: America Online 7.0 Tray Icon.lnk = C:\Program Files\America Online 7.0m\aoltray.exe
O9 - Extra button: AOL Toolbar - {4982D40A-C53B-4615-B15B-B5B5E98D167C} - C:\Program Files\AOL Toolbar\toolbar.dll
O9 - Extra 'Tools' menuitem: AOL Toolbar - {4982D40A-C53B-4615-B15B-B5B5E98D167C} - C:\Program Files\AOL Toolbar\toolbar.dll
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\System32\Shdocvw.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
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {4A3CF76B-EC7A-405D-A67D-8DC6B52AB35B} (QDiagAOLCCUpdateObj Class) - http://aolcc.aol.com/computercheckup/qdiagcc.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.co...?1095892489693
O16 - DPF: {A02780C3-7F77-4E28-855B-28890F3CF37A} - http://akamai.downloadv3.com/binarie...35_pack_XP.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{CA2EDA0E-D8E2-4C1F-8FBC-6195884379DD}: NameServer = 205.188.146.146

Insert the XP disk into the machine and turn it on. A message will appear asking you to press any key to boot to the XP CD. Press any key and the machine will boot to the CD. When the setup screen loads choose the option to repair the windows installation by pressing R. It will then ask you what drive (the drive windows XP is installed on)you want to go to. Choose whichever drive this is...C,D or E, etc.
It will then ask you for and administor password. Generally this is blank so just hit return but if you created an administrator password when you first installed windows then use that one.
You will be then brought to the dos prompt of the drive windows XP is installed on. Lets say for arguments sake the drive windows is installed on here is C and the CD drive is D
So you will see C:\>
At this prompt type the following copy D:\i386\ha.dl_ C:\windows\system32\hal.dll

So it should appear on the screen as

C:\>copy D:\i386\ha.dl_ C:\windows\system32\hal.dll
Hit return and it will then ask you if you want to overwrite the file hal.dll if its there, type Y and hit return. It will then say ! file copied.
When this is done simply reboot your computer and it should boot up normally.
It worked for me perfectly.