PC très lent et infecté: log Malwarebytes.

Bonjour, suite à un fort ralentissement de mon PC depuis quelques temps: lancement des applications abominablement long, difficultés à enregistrer un simple document word, internet genre "56k" (avec Firefox3), je me suis décider à scanner le pc avec Malwarebytes que l'on m'a recommandé.

Pour info, je dispose d'Avast home 4.8 version gratuite

Voici le log obtenu avec Malwarebytes: beaucoup d'infections trouvées avec un scan rapide et normalement ensuite supprimées. Qu'en pensez vous? Est-ce que cela necessite un nettoyage plus en profondeur ? Si oui, quelqu'un peut-il me prendre en charge pour m'expliquer la marche à suivre?

Merci d'avance !

Malwarebytes' Anti-Malware 1.34
Version de la base de données: 1831
Windows 5.1.2600 Service Pack 3

10/03/2009 11:47:28
mbam-log-2009-03-10 (11-47-28).txt

Type de recherche: Examen rapide
Eléments examinés: 64785
Temps écoulé: 7 minute(s), 51 second(s)

Processus mémoire infecté(s): 0
Module(s) mémoire infecté(s): 0
Clé(s) du Registre infectée(s): 29
Valeur(s) du Registre infectée(s): 2
Elément(s) de données du Registre infecté(s): 0
Dossier(s) infecté(s): 2
Fichier(s) infecté(s): 3

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

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

Clé(s) du Registre infectée(s):
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{6d794cb4-c7cd-4c6f-bfdc-9b77afbdc02c} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{f919fbd3-a96b-4679-af26-f551439bb5fd} (Trojan.FakeAlert) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{d38439ec-4a7f-42b4-90c2-d810d7778fdd} (Trojan.ConHook) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{09f1adac-76d8-4d0f-99a5-5c907dadb988} (Rogue.Multiple) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{d651aff4-9590-424d-bd1e-8e33e090dfb3} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{cd3447d4-ca39-4377-8084-30e86331d74c} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{013a653b-49a6-4f76-8b68-e4875ea6ba54} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{1daefcb9-06c8-47c6-8f20-3fb54b244daa} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{1557b435-8242-4686-9aa3-9265bf7525a4} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{35f7813a-af74-4474-b1dc-7ee6fb6c43c6} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{3fd6b99c-a275-46ea-8fd1-3d63986e51e4} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{46a4e9d9-b30e-452a-8157-dbbec8573b03} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{57e218e6-5a80-4f0c-ab25-83598f25d7e9} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{67c55a8d-e808-4caa-9ea7-f77102de0bb6} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{68d5cf1d-ec5c-4bdd-a9ef-f0e517565d50} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{74dd705d-6834-439c-a735-a6dbe2677452} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{7da39570-5fd2-4f18-94b4-20730cb3f727} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{849b9523-785f-4014-9caf-079fb4a74c61} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{e03c740e-bb24-4d3c-b92a-6f84de1dd99c} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{f18f04b0-9cf1-4b93-b004-77a288bee28b} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{b64f4a7c-97c9-11da-8bde-f66bad1e3f3a} (Rogue.WinAntivirus) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{2d2bee6e-3c9a-4d58-b9ec-458edb28d0f6} (Rogue.DriveCleaner) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{5adf3862-9e2e-4ad3-86f7-4510e6550cd0} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{e12bff69-38a7-406e-a8ef-2738107a7831} (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{74dd705d-6834-439c-a735-a6dbe2677452} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\aldd (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\rdfa (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Juan (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\aoprndtws (Trojan.Vundo) -> Quarantined and deleted successfully.

Valeur(s) du Registre infectée(s):
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\URLSearchHooks\{4d25f926-b9fe-4682-bf72-8ab8210d6d75} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Toolbar\WebBrowser\{74dd705d-6834-439c-a735-a6dbe2677452} (Trojan.Vundo) -> Quarantined and deleted successfully.

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

Dossier(s) infecté(s):
C:\Documents and Settings\Alex\Application Data\searchtoolbarcorp (Adware.Agent) -> Quarantined and deleted successfully.
C:\Documents and Settings\Alex\Application Data\searchtoolbarcorp\Toolbar Vision (Adware.Agent) -> Quarantined and deleted successfully.

Fichier(s) infecté(s):
C:\Documents and Settings\Alex\Application Data\searchtoolbarcorp\Toolbar Vision\PageHistory.txt (Adware.Agent) -> Quarantined and deleted successfully.
C:\Documents and Settings\Alex\Application Data\searchtoolbarcorp\Toolbar Vision\WebHistory.txt (Adware.Agent) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\mcrh.tmp (Malware.Trace) -> Quarantined and deleted successfully.