Hola:
No sé desde cuando puede haber ocurrido pero ayer me di cuenta que un amigo me pasó un enlace para descargarme unas fotos de dropbox y firefox, chrome, edge... me rechazan la descarga.

Cual es mi sopresa que se me ocurrió activar la aplicación Psiphon3 y si me descargué el archivo zip del dropbox. Nosé si me pasará con otras webs que no sean dropbox pero es la única que me ha dado ese problema.

He pasado el antivirus, desactivado el mismo, reiniciado el router, mirado que no tenda nada en el arranque, probado en los navegadores a prueba de fallos, revisado los "run" del currentversión en el registro... y más cosas que no recuerdo...

Tengo W10 Pro actualizado.. ¿se os ocurre qué puede haber ocurrido??

Gracias por leerme

R0 - HKCU\Software\Microsoft\Internet Explorer\Main: [Start Page] = http://www.bing.com/?pc=COS2&ptag=D091620-A2D586A4510&form=CONMHP&conlogo=CT3335800
R0 - HKLM\Software\Microsoft\Internet Explorer\Main: [Start Page] = www.google.com
R4 - SearchScopes: HKCU\Software\Microsoft\Internet Explorer\SearchScopes\{0633EE93-D776-472f-A0FF-E1416B8B2E3A}: [SuggestionsURL] = https://www.bing.com/osjson.aspx?query={searchTerms} - Bing
O2 - HKLM\..\BHO: ExplorerWnd Helper - {10921475-03CE-4E04-90CE-E2E7EF20C814} - C:\Program Files (x86)\IObit\IObit Uninstaller\UninstallExplorer.dll
O2 - HKLM\..\BHO: IEToEdge BHO - {1FD49718-1D00-4B19-AF5F-070AF6D5D54C} - C:\Program Files (x86)\Microsoft\Edge\Application\87.0.664.75\BHO\ie_to_edge_bho_64.dll
O2-32 - HKLM\..\BHO: IEToEdge BHO - {1FD49718-1D00-4B19-AF5F-070AF6D5D54C} - C:\Program Files (x86)\Microsoft\Edge\Application\87.0.664.75\BHO\ie_to_edge_bho.dll
O2-32 - HKLM\..\BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre1.8.0_271\bin\jp2ssv.dll
O2-32 - HKLM\..\BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files (x86)\Java\jre1.8.0_271\bin\ssv.dll
O4 - Global User Startup: C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\ctfmon.exe - Acceso directo (2).lnk    ->    C:\WINDOWS\SysWOW64\ctfmon.exe
O4 - HKCU\..\Run: [RocketDock] = C:\Program Files (x86)\RocketDock\RocketDock.exe
O4 - HKLM\..\Run: [AvastUI.exe] = C:\Program Files\AVAST Software\Avast\AvLaunch.exe /gui
O4 - HKLM\..\StartupApproved\Run: [RTHDVCPL] = C:\Program Files\Realtek\Audio\HDA\RtkNGUI64.exe -s (2020/03/15)
O4 - User Startup: C:\Users\JPD_TOWER\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SoundBooster.exe.lnk    ->    C:\Program Files (x86)\Letasoft Sound Booster\SoundBooster.exe
O15 - Trusted Zone: *.localhost
O15 - Trusted Zone: http://webcompanion.com
O15 - Trusted Zone: https://www.registradores.org
O17 - DHCP DNS 1: 212.166.211.4
O17 - DHCP DNS 2: 212.166.132.96
O18 - HKLM\Software\Classes\Protocols\Handler\ms-help: [CLSID] = {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Program Files\Common Files\Microsoft Shared\Help\hxds.dll
O21 - HKLM\..\ShellIconOverlayIdentifiers\                    IMFSafeBox: BlueBirdShell Class - {0BB81440-5F42-4480-A5F7-770A6F439FC8} - C:\Program Files (x86)\IObit\IObit Malware Fighter\IMFShellExt.dll
O21 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive1: (no name) - {BBACC218-34EA-4666-9D7A-C78F2274A524} - (no file)
O21 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive2: (no name) - {5AB7172C-9C11-405C-8DD5-AF20F3606282} - (no file)
O21 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive3: (no name) - {A78ED123-AB77-406B-9962-2A5D9D2F7F30} - (no file)
O21 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive4: (no name) - {F241C880-6982-4CE5-8CF7-7085BA96DA5A} - (no file)
O21 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive5: (no name) - {A0396A93-DC06-4AEF-BEE9-95FFCCAEF20E} - (no file)
O21 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive6: (no name) - {9AA2F32D-362A-42D9-9328-24A483E2CCC3} - (no file)
O21 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive7: (no name) - {C5FF006E-2AE9-408C-B85B-2DFDD5449D9C} - (no file)
O21 - HKLM\..\ShellIconOverlayIdentifiers\00asw: avast - {472083B0-C522-11CF-8763-00608CC02F24} - C:\Program Files\AVAST Software\Avast\ashShell.dll
O21-32 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive1: (no name) - {BBACC218-34EA-4666-9D7A-C78F2274A524} - (no file)
O21-32 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive2: (no name) - {5AB7172C-9C11-405C-8DD5-AF20F3606282} - (no file)
O21-32 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive3: (no name) - {A78ED123-AB77-406B-9962-2A5D9D2F7F30} - (no file)
O21-32 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive4: (no name) - {F241C880-6982-4CE5-8CF7-7085BA96DA5A} - (no file)
O21-32 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive5: (no name) - {A0396A93-DC06-4AEF-BEE9-95FFCCAEF20E} - (no file)
O21-32 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive6: (no name) - {9AA2F32D-362A-42D9-9328-24A483E2CCC3} - (no file)
O21-32 - HKLM\..\ShellIconOverlayIdentifiers\ OneDrive7: (no name) - {C5FF006E-2AE9-408C-B85B-2DFDD5449D9C} - (no file)
O22 - Task (.job): (disabled) (Not scheduled) Intel PTT EK Recertification.job - C:\WINDOWS\System32\DriverStore\FileRepository\iclsclient.inf_amd64_75ffca5eec865b4b\lib\IntelPTTEKRecertification.exe
O22 - Task: (disabled) (update) \Microsoft\Windows\UpdateOrchestrator\Reboot_AC - C:\WINDOWS\system32\MusNotification.exe /RunOnAC RebootDialog (Microsoft)
O22 - Task: (disabled) (update) \Microsoft\Windows\UpdateOrchestrator\Reboot_Battery - C:\WINDOWS\system32\MusNotification.exe /RunOnBattery RebootDialog (Microsoft)
O22 - Task: (disabled) AdobeGCInvoker-1.0 - C:\Program Files (x86)\Common Files\Adobe\AdobeGCClient\AGCInvokerUtility.exe -mode=scheduled
O22 - Task: (disabled) \Microsoft\Windows\Management\Provisioning\Retry - C:\WINDOWS\system32\ProvTool.exe /turn 5 /source ProvRetryTask (Microsoft)
O22 - Task: (disabled) \Microsoft\Windows\Management\Provisioning\RunOnReboot - C:\WINDOWS\system32\ProvTool.exe /turn 5 /source ContinueSessionTask (Microsoft)
O22 - Task: (disabled) \Microsoft\Windows\Shell\FamilySafetyMonitorToastTask - {D2CBF5F7-5702-440B-8D8F-8203034A6B82},$(Arg0) - (no file)
O22 - Task: (disabled) \Microsoft\Windows\UpdateOrchestrator\Schedule Maintenance Work - C:\WINDOWS\system32\usoclient.exe StartMaintenanceWork (Microsoft)
O22 - Task: (disabled) \Microsoft\Windows\UpdateOrchestrator\Schedule Wake To Work - C:\WINDOWS\system32\usoclient.exe StartWork (Microsoft)
O22 - Task: (telemetry) \Microsoft\Windows\Application Experience\PcaPatchDbTask - C:\WINDOWS\system32\rundll32.exe C:\WINDOWS\system32\PcaSvc.dll,PcaPatchSdbTask (Microsoft)
O22 - Task: (update) \Microsoft\Windows\UpdateOrchestrator\USO_UxBroker - C:\WINDOWS\system32\MusNotification.exe (Microsoft)
O22 - Task: Avast Emergency Update - C:\Program Files\AVAST Software\Avast\AvEmUpdate.exe
O22 - Task: Driver Booster Scheduler - C:\Program Files (x86)\IObit\Driver Booster\8.0.2\Scheduler.exe /scheduler
O22 - Task: GoogleUpdateTaskMachineCore - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe /c
O22 - Task: GoogleUpdateTaskMachineCore1d6ca0a2df327f9 - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe /c
O22 - Task: GoogleUpdateTaskMachineUA - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe /ua /installsource scheduler
O22 - Task: GoogleUpdateTaskMachineUA1d6ca0a2df5f82e - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe /ua /installsource scheduler
O22 - Task: IMF_SkipUAC_JPD_TOWER - C:\Program Files (x86)\IObit\IObit Malware Fighter\IMF.exe /SkipUac
O22 - Task: Intel PTT EK Recertification - C:\WINDOWS\System32\DriverStore\FileRepository\iclsclient.inf_amd64_75ffca5eec865b4b\lib\IntelPTTEKRecertification.exe
O22 - Task: OneDrive Standalone Update Task-S-1-5-21-1640731472-3253829319-3592857273-500 - C:\Users\JPD_TOWER\AppData\Local\Microsoft\OneDrive\OneDriveStandaloneUpdater.exe (file missing)
O22 - Task: OneDrive Standalone Update Task-S-1-5-21-2819557380-2876920998-2071874008-500 - C:\Users\JPD_TOWER\AppData\Local\Microsoft\OneDrive\OneDriveStandaloneUpdater.exe (file missing)
O22 - Task: SmartDefrag_AutoAnalyze - C:\Program Files (x86)\IObit\Smart Defr\AutoDefrag.exe /AUTOANALYZE
O22 - Task: SmartDefrag_Update - C:\Program Files (x86)\IObit\Smart Defr\AutoUpdate.exe /autorun
O22 - Task: Uninstaller_SkipUac_JPD_TOWER - C:\Program Files (x86)\IObit\IObit Uninstaller\IObitUninstaler.exe /UninstallExplorer
O22 - Task: \Avast Software\Overseer - C:\Program Files\Common Files\AVAST Software\Overseer\overseer.exe /from_scheduler:1
O22 - Task: \Microsoft\Windows\SMB\UninstallSMB1ClientTask - C:\WINDOWS\system32\WindowsPowerShell\v1.0\powershell.exe -ExecutionPolicy Unrestricted -NonInteractive -NoProfile -WindowStyle Hidden "& C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules\SmbShare\DisableUnusedSmb1.ps1 -Scenario Client"
O22 - Task: \Microsoft\Windows\SMB\UninstallSMB1ServerTask - C:\WINDOWS\system32\WindowsPowerShell\v1.0\powershell.exe -ExecutionPolicy Unrestricted -NonInteractive -NoProfile -WindowStyle Hidden "& C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules\SmbShare\DisableUnusedSmb1.ps1 -Scenario Server"
O22 - Task: \Microsoft\Windows\UpdateOrchestrator\AC Power Install - C:\WINDOWS\system32\usoclient.exe StartInstall (Microsoft)
O22 - Task: \Mozilla\Firefox Default Browser Agent 308046B0AF4A39CB - C:\Program Files\Mozilla Firefox\default-browser-agent.exe do-task "308046B0AF4A39CB"
O23 - Service R2: Advanced SystemCare Service 13 - (ADVANCEDSYSTEMCARESERVICE13) - C:\Program Files (x86)\Advanced SystemCare Pro\ASCService.exe
O23 - Service R2: Avast Antivirus - (avast! Antivirus) - C:\Program Files\AVAST Software\Avast\AvastSvc.exe /runassvc
O23 - Service R2: AvastWscReporter - C:\Program Files\AVAST Software\Avast\wsc_proxy.exe /runassvc /rpcserver
O23 - Service R2: Bluetooth Driver Management Service - (BcmBtRSupport) - C:\WINDOWS\system32\BtwRSupportService.exe
O23 - Service R2: Intel(R) Dynamic Application Loader Host Interface Service - (jhi_service) - C:\WINDOWS\System32\DriverStore\FileRepository\dal.inf_amd64_ffc75848a6342fdf\jhi_service.exe
O23 - Service R3: Intel(R) Content Protection HDCP Service - (cplspcon) - C:\WINDOWS\System32\DriverStore\FileRepository\iigd_base.inf_amd64_6facd738cc4484c9\IntelCpHDCPSvc.exe
O23 - Service R3: Intel(R) Content Protection HECI Service - (cphs) - C:\WINDOWS\System32\DriverStore\FileRepository\iigd_base.inf_amd64_6facd738cc4484c9\IntelCpHeciSvc.exe
O23 - Service S2: IMF Service - (IMFservice) - C:\Program Files (x86)\IObit\IObit Malware Fighter\IMFSrv.exe
O23 - Service S2: Intel(R) TPM Provisioning Service - C:\WINDOWS\System32\DriverStore\FileRepository\iclsclient.inf_amd64_75ffca5eec865b4b\lib\TPMProvisioningService.exe
O23 - Service S3: Brother USB Application Controller - (USBAppControl) - C:\Program Files (x86)\Brother\iPrint&Scan\USBAppControl.exe
O23 - Service S3: Brother Workflow Application Controller - (WorkflowAppControl) - C:\Program Files (x86)\Brother\iPrint&Scan\WorkflowAppControl.exe
O23 - Service S3: Intel(R) Capability Licensing Service TCP IP Interface - C:\WINDOWS\System32\DriverStore\FileRepository\iclsclient.inf_amd64_75ffca5eec865b4b\lib\SocketHeciServer.exe
O23 - Service S3: Letasoft Sound Booster Service - (SoundBoosterService) - C:\Program Files (x86)\Letasoft Sound Booster\SoundBoosterService.exe
O23 - Service S3: Office 64 Source Engine - (ose64) - C:\Program Files\Common Files\Microsoft Shared\Source Engine\OSE.EXE
O23 - Service S3: aswbIDSAgent - C:\Program Files\AVAST Software\Avast\aswidsagent.exe

Hola r32:
Mil gracias por contestar
¿cómo cambio los DNS? He leido en el enlace lo referente al "o17" y pone..

Eliminado.

Gracias

Muchas gracias por la ayuda y por adelantarnos próximos acontecimientos