Fenetres pub qui s'ouvrent intempestivement..

Bonjour chère communauté,
Pourriez-vous m'assister dans la desinfection de mon PC, certes ce n'est pas un énorme problème, simplement j'ai des fenêtres qui s'affichent et c'est assez gênant, pas du tout commode.

Alors que puis-je dire d'emblée, PC Windows XP Service Pack 3/ Firefox 4.0.1/ AMD Turion Mobile 64 / 1.59GHz, 896 Mo de Ram.

J'avais fait un scan complet avec MBAM, dernière version, voici la copie du log.

Malwarebytes' Anti-Malware 1.51.0.1200
www.malwarebytes.org

Version de la base de données: 6773

Windows 5.1.2600 Service Pack 3
Internet Explorer 6.0.2900.5512

05/06/2011 16:48:16
mbam-log-2011-06-05 (16-48-16).txt

Type d'examen: Examen complet (C:\|)
Elément(s) analysé(s): 231710
Temps écoulé: 1 heure(s), 38 minute(s), 13 seconde(s)

Processus mémoire infecté(s): 0
Module(s) mémoire infecté(s): 1
Clé(s) du Registre infectée(s): 7
Valeur(s) du Registre infectée(s): 2
Elément(s) de données du Registre infecté(s): 0
Dossier(s) infecté(s): 0
Fichier(s) infecté(s): 12

Processus mémoire infecté(s):
(Aucun élément nuisible détecté)

Module(s) mémoire infecté(s):
c:\WINDOWS\system32\sshnas21.dll (Trojan.Downloader) -> Delete on reboot.

Clé(s) du Registre infectée(s):
HKEY_CURRENT_USER\SOFTWARE\CY08W456F0 (Trojan.FakeAlert.SA) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\GAGEZ8R8ZB (Trojan.FakeAlert.SA) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\NtWqIVLZEWZU (Trojan.FakeAlert) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\YDZ1QVAGOJ (Trojan.FakeAlert.SA) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\Software\Microsoft\idgbn5xehg (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\ (Hijack.Zones) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SSHNAS (Trojan.Renos) -> Quarantined and deleted successfully.

Valeur(s) du Registre infectée(s):
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\YDZ1QVAGOJ (Trojan.FakeAlert.SA) -> Value: YDZ1QVAGOJ -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NtWqIVLZEWZU (Trojan.FakeAlert) -> Value: NtWqIVLZEWZU -> Quarantined and deleted successfully.

Elément(s) de données du Registre infecté(s):
(Aucun élément nuisible détecté)

Dossier(s) infecté(s):
(Aucun élément nuisible détecté)

Fichier(s) infecté(s):
c:\WINDOWS\system32\sshnas21.dll (Trojan.Downloader) -> Delete on reboot.
c:\documents and settings\mo\local settings\Temp\Hdb.exe (Trojan.Downloader) -> Quarantined and deleted successfully.
c:\documents and settings\mo\local settings\Temp\Hdd.exe (Trojan.Downloader) -> Quarantined and deleted successfully.
c:\documents and settings\mo\local settings\Temp\Hde.exe (Trojan.Downloader) -> Quarantined and deleted successfully.
c:\documents and settings\mo\local settings\Temp\sshnas21.dll (Trojan.Downloader) -> Quarantined and deleted successfully.
c:\program files\jdownloader\downloads\Crack\magix.video.deluxe.17.premium..[dlv]-mpt.exe (PUP.Hacktool.Patcher) -> Not selected for removal.
c:\program files\MAGIX\video_deluxe_17_premium_version_a_telecharger\magix.video.deluxe.17.premium..[dlv]-mpt.exe (PUP.Hacktool.Patcher) -> Not selected for removal.
c:\WINDOWS\Tasks\{22116563-108c-42c0-a7ce-60161b75e508}.job (Trojan.Downloader) -> Quarantined and deleted successfully.
c:\WINDOWS\Tasks\{bbaeaeaf-1275-40e2-bd6c-bc8f88bd114a}.job (Trojan.Downloader) -> Quarantined and deleted successfully.
c:\WINDOWS\Tasks\{810401e2-dde0-454e-b0e2-aa89c9e5967c}.job (Trojan.FraudPack) -> Quarantined and deleted successfully.
c:\documents and settings\mo\local settings\Temp\Hdh.exe (Trojan.FakeAlert.SA) -> Quarantined and deleted successfully.
c:\documents and settings\mo\local settings\Temp\Hdm.exe (Trojan.FakeAlert) -> Quarantined and deleted successfully.