Hola Caito, en serio agradezco tu ayuda.
Realicé los pasos que me dijiste:
a) Lo referente a O23 - Service:Command Service (cmdService) - Unknown owner - C:\WINDOWS\QWRtaW5pc3RyYWRvcgAA\command.exe no fue necesario, pues el archivo ya no existe.

El mensajero de windows estaba inhabilitado y así lo dejé.
c) No pude borrar el guard.tmp desde safe mode con el killbox. Ese maldito archivo parece ser indestructible y es el problema de todo....
d) Tenías razón, encontré el log del l2mfix. Es el que dice Report?...
Realicé de nuevos los scans, aquí te pongo los logs, en el mismo orden en que ejecuté:
Ewido---------------------------------------------------------
ewido security suite - Report de exploración
---------------------------------------------------------
+ Creado en: 10:35:04 a.m., 25/10/2005
+ Report-Checksum: E22611E5
+ Scan result:
[756] C:\WINDOWS\system32\guard.tmp -> Spyware.Look2Me : Error durante limpieza
[820] C:\WINDOWS\system32\mbmtapi.dll -> Spyware.Look2Me : Limpio con backup
C:\Documents and Settings\Administrador\Configuración local\Archivos temporales de Internet\Content.IE5\WNQVMNU1\mm[2].js -> Spyware.Chitika : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@ad.yieldmanager[2].txt -> Spyware.Cookie.Yieldmanager : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@atdmt[2].txt -> Spyware.Cookie.Atdmt : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@commission-junction[2].txt -> Spyware.Cookie.Commission-junction : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@doubleclick[1].txt -> Spyware.Cookie.Doubleclick : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@e-2dj6wjmygoc5mhq.stats.esomniture[2].txt -> Spyware.Cookie.Esomniture : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@mediaplex[1].txt -> Spyware.Cookie.Mediaplex : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@statse.webtrendslive[1].txt -> Spyware.Cookie.Webtrendslive : Limpio con backup
C:\Documents and Settings\Administrador\Cookies\administrador@www.epilot[1].txt -> Spyware.Cookie.Epilot : Limpio con backup
C:\WINDOWS\system32\mbmtapi.dll -> Spyware.Look2Me : Limpio con backup
::Fin Report
l2mfixL2MFIX find log 1.04a
These are the registry keys present
********************************************************************************
**
Winlogon/notify:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify]
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\crypt32chain]
"Asynchronous"=dword:00000000
"Impersonate"=dword:00000000
"DllName"=hex(2):63,00,72,00,79,00,70,00,74,00,33,00,32,00,2e,00,64,00,6c,00,\
6c,00,00,00
"Logoff"="ChainWlxLogoffEvent"
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\cryptnet]
"Asynchronous"=dword:00000000
"Impersonate"=dword:00000000
"DllName"=hex(2):63,00,72,00,79,00,70,00,74,00,6e,00,65,00,74,00,2e,00,64,00,\
6c,00,6c,00,00,00
"Logoff"="CryptnetWlxLogoffEvent"
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\cscdll]
"DLLName"="cscdll.dll"
"Logon"="WinlogonLogonEvent"
"Logoff"="WinlogonLogoffEvent"
"ScreenSaver"="WinlogonScreenSaverEvent"
"Startup"="WinlogonStartupEvent"
"Shutdown"="WinlogonShutdownEvent"
"StartShell"="WinlogonStartShellEvent"
"Impersonate"=dword:00000000
"Asynchronous"=dword:00000001
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\Dynamic Directory]
"Asynchronous"=dword:00000000
"DllName"="C:\\WINDOWS\\system32\\enj8l11u1.dll"
"Impersonate"=dword:00000000
"Logon"="WinLogon"
"Logoff"="WinLogoff"
"Shutdown"="WinShutdown"
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\igfxcui]
@=""
"DLLName"="igfxsrvc.dll"
"Asynchronous"=dword:00000001
"Impersonate"=dword:00000001
"Unlock"="WinlogonUnlockEvent"
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\ScCertProp]
"DLLName"="wlnotify.dll"
"Logon"="SCardStartCertProp"
"Logoff"="SCardStopCertProp"
"Lock"="SCardSuspendCertProp"
"Unlock"="SCardResumeCertProp"
"Enabled"=dword:00000001
"Impersonate"=dword:00000001
"Asynchronous"=dword:00000001
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\Schedule]
"Asynchronous"=dword:00000000
"DllName"=hex(2):77,00,6c,00,6e,00,6f,00,74,00,69,00,66,00,79,00,2e,00,64,00,\
6c,00,6c,00,00,00
"Impersonate"=dword:00000000
"StartShell"="SchedStartShell"
"Logoff"="SchedEventLogOff"
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\sclgntfy]
"Logoff"="WLEventLogoff"
"Impersonate"=dword:00000000
"Asynchronous"=dword:00000001
"DllName"=hex(2):73,00,63,00,6c,00,67,00,6e,00,74,00,66,00,79,00,2e,00,64,00,\
6c,00,6c,00,00,00
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\SensLogn]
"DLLName"="WlNotify.dll"
"Lock"="SensLockEvent"
"Logon"="SensLogonEvent"
"Logoff"="SensLogoffEvent"
"Safe"=dword:00000001
"MaxWait"=dword:00000258
"StartScreenSaver"="SensStartScreenSaverEvent"
"StopScreenSaver"="SensStopScreenSaverEvent"
"Startup"="SensStartupEvent"
"Shutdown"="SensShutdownEvent"
"StartShell"="SensStartShellEvent"
"PostShell"="SensPostShellEvent"
"Disconnect"="SensDisconnectEvent"
"Reconnect"="SensReconnectEvent"
"Unlock"="SensUnlockEvent"
"Impersonate"=dword:00000001
"Asynchronous"=dword:00000001
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\termsrv]
"Asynchronous"=dword:00000000
"DllName"=hex(2):77,00,6c,00,6e,00,6f,00,74,00,69,00,66,00,79,00,2e,00,64,00,\
6c,00,6c,00,00,00
"Impersonate"=dword:00000000
"Logoff"="TSEventLogoff"
"Logon"="TSEventLogon"
"PostShell"="TSEventPostShell"
"Shutdown"="TSEventShutdown"
"StartShell"="TSEventStartShell"
"Startup"="TSEventStartup"
"MaxWait"=dword:00000258
"Reconnect"="TSEventReconnect"
"Disconnect"="TSEventDisconnect"
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\wlballoon]
"DLLName"="wlnotify.dll"
"Logon"="RegisterTicketExpiredNotificationEvent"
"Logoff"="UnregisterTicketExpiredNotificationEvent"
"Impersonate"=dword:00000001
"Asynchronous"=dword:00000001
RegDACL 5.1 - Permissions Manager for Registry keys for Windows NT 4 and above
Copyright © 1999-2001 Frank Heyne Software (http://www.heysoft.de)
This program is Freeware, use it on your own risk!
Access Control List for Registry key HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify:
(NI) ALLOW Full access NT AUTHORITY\SYSTEM
(IO) ALLOW Full access NT AUTHORITY\SYSTEM
(NI) ALLOW Full access NT AUTHORITY\SYSTEM
(IO) ALLOW Full access NT AUTHORITY\SYSTEM
(ID-NI) ALLOW Read BUILTIN\Usuarios
(ID-IO) ALLOW Read BUILTIN\Usuarios
(ID-NI) ALLOW Read BUILTIN\Usuarios avanzados
(ID-IO) ALLOW Read BUILTIN\Usuarios avanzados
(ID-NI) ALLOW Full access BUILTIN\Administradores
(ID-IO) ALLOW Full access BUILTIN\Administradores
(ID-NI) ALLOW Full access NT AUTHORITY\SYSTEM
(ID-IO) ALLOW Full access NT AUTHORITY\SYSTEM
(ID-IO) ALLOW Full access CREATOR OWNER
********************************************************************************
**
useragent:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\User Agent\Post Platform]
"{5B86A424-EF1F-2A26-5705-89