Muchas gracias por las instrucciones. Parece que de momento va todo perfecto.

El ComboFix no he podido hacerlo funcionar ya que pulsaba dos veces, se abría una ventana y se cerraba rápidamente.

Aquí dejo mi log de MALWAREBYTES:

Malwarebytes' Anti-Malware 1.12
Versión de la Base de Datos: 744

Tipo de examen : Examen Completo (C:\|)
Objetos examinados: 203635
Tiempo transcurrido: 1 hour(s), 16 minute(s), 6 second(s)

Procesos en Memoria Infectados: 0
Módulos en Memoria Infectados: 2
Claves del Registro Infectadas: 24
Valores del Registro Infectados: 2
Elementos de Datos del Registro Infectados: 2
Carpetas Infectadas: 0
Ficheros Infectados: 24

Procesos en Memoria Infectados:
(No se han detectado elementos maliciosos)

Módulos en Memoria Infectados:
C:\WINDOWS\system32\qvuxyvxn.dll (Trojan.Vundo) -> Unloaded module successfully.
C:\WINDOWS\system32\rqRKCssR.dll (Trojan.Vundo) -> Unloaded module successfully.

Claves del Registro Infectadas:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Explorer\Browser Helper Objects\{6c19aa22-5e2a-4bb3-9ce0-ac414db278e8} (Trojan.Vundo) -> Delete on reboot.
HKEY_CLASSES_ROOT\CLSID\{6c19aa22-5e2a-4bb3-9ce0-ac414db278e8} (Trojan.Vundo) -> Delete on reboot.
HKEY_CLASSES_ROOT\CLSID\{7f3ea905-de65-4d00-bc1f-ff3a77f8ca30} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488b2-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488b3-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488b4-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488b5-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488b6-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488b7-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488b9-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488ba-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{2dc488bb-d891-101b-8652-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{8996b0a1-d7be-101b-8650-00aa003a5593} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\aoprndtws (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\Software\Microsoft\affri (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\Software\Microsoft\affltid (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\WR (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\Software\Microsoft\rdfa (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\affltid (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\affri (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MS Juan (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\FCOVM (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RemoveRP (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Helper (Spyware.Banker) -> Quarantined and deleted successfully.

Valores del Registro Infectados:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Explorer\ShellExecuteHooks\{7f3ea905-de65-4d00-bc1f-ff3a77f8ca30} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run\BM57b7ed91 (Trojan.Agent) -> Delete on reboot.

Elementos de Datos del Registro Infectados:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\LSA\Authentication Packages (Trojan.Vundo) -> Data: c:\windows\system32\rqrkcssr -> Delete on reboot.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Lsa\Authentication Packages (Trojan.Vundo) -> Data: c:\windows\system32\rqrkcssr -> Delete on reboot.

Carpetas Infectadas:
(No se han detectado elementos maliciosos)

Ficheros Infectados:
C:\WINDOWS\system32\fhpssfmt.dll (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\tmfssphf.ini (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\iygrfypp.dll (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\ppyfrgyi.ini (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\ofgvevcy.dll (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\ycvevgfo.ini (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\qvuxyvxn.dll (Trojan.Vundo) -> Delete on reboot.
C:\WINDOWS\system32\nxvyxuvq.ini (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\rqRKCssR.dll (Trojan.Vundo) -> Delete on reboot.
C:\WINDOWS\system32\RssCKRqr.ini (Trojan.Vundo) -> Delete on reboot.
C:\WINDOWS\system32\RssCKRqr.ini2 (Trojan.Vundo) -> Delete on reboot.
C:\Documents and Settings\Tino\Configuración local\Archivos temporales de Internet\Content.IE5\YR7T3670\moorate[1] (Trojan.AVKiller) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{03E39A46-99CA-4C28-BB0B-D904C3C951B7}\RP1306\A0343154.dll (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{03E39A46-99CA-4C28-BB0B-D904C3C951B7}\RP1306\A0343160.dll (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{03E39A46-99CA-4C28-BB0B-D904C3C951B7}\RP1309\A0344308.dll (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{03E39A46-99CA-4C28-BB0B-D904C3C951B7}\RP1309\A0344346.dll (Trojan.Vundo) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\dbyedneu.dll (Trojan.AVKiller) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\xvvubflt.dll (Trojan.AVKiller) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\Cfx32.ocx (Trojan.Agent) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\yqhulici.dll (Trojan.Agent) -> Delete on reboot.
C:\WINDOWS\system32\ps.dat (Malware.Trace) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\cookie.dat (Malware.Trace) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\alog.txt (Stolen.Data) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\help.txt (Stolen.Data) -> Quarantined and deleted successfully.