Problème apparemment résolu grâce à ADWcleaner : résultat du rapport
***** [ Folders ] *****
Deleted: C:\Program Files\WinZip\WinZip Smart Monitor
Deleted: C:\Users\DAVID\AppData\Local\AdvinstAnalytics
Deleted: C:\Program Files (x86)\devnull
Deleted: C:\Users\DAVID\AppData\Roaming\devnull
Deleted: C:\Program Files (x86)\ProxyGate
***** [ Files ] *****
Deleted: C:\END
***** [ Registry ] *****
Deleted: [Key] - HKCU\Software\Classes\Applications\interstatnogui.exe
Deleted: [Key] - HKLM\SYSTEM\CurrentControlSet\Services\EventLog\Reason\ReasonByteFence
Deleted: [Key] - HKU\S-1-5-21-3068345264-954547611-1044726883-1001\Software\SetupCompany
Deleted: [Key] - HKCU\Software\SetupCompany
Deleted: [Key] - HKU\S-1-5-21-3068345264-954547611-1044726883-1001\Software\Microsoft\Etsy
Deleted: [Key] - HKCU\Software\Microsoft\Etsy
Hijack.Autoconfigurl.prxysvrrst détecté par Malwarebytes