Merci pour la suggestion mwonex. J'y penserais après le prochain crash, si jamais, parce que pour l'instant, c'est stable, comme tu le verras ci-dessous.
Dans l'intervalle ma demande d'analyse et de désinfection a abouti : il n'y a rien à signaler.
Juste après mon précédent message, j'ai encore eu un écran bleu DPC WATCH DOG VIOLATION. Après celui-ci, je n'avais à nouveau aucun réseau Wifi de disponible.
Néanmoins, après avoir arrêté le PC, éteint le bloc d'alimentation avec l'interrupteur, débranché et rebranché le fil électrique de l'alimentation (sur une autre prise), ça refonctionnait.
Depuis, c'est à dire depuis 24 heures, rien à signaler, tout roule.
Il te semble imaginable que ça vienne de mon branchement électrique ? D'habitude, le câble qui part du PC est branché dans une multiprise, laquelle est branchée sur une rallonge, laquelle va directement dans une prise murale.
Si c'était un problème d'alimentation électrique, ce que j'aurais de la peine à comprendre, c'est que ça affecte le Wifi sans affecter le PC lui-même.
Une autre idée ?
Voici ce qu'indique l'observateur d'événements :
Nom du journal :System
Source : Microsoft-Windows-Kernel-Power
Date : 06.01.2018 09:55:58
ID de l’événement :41
Catégorie de la tâche

63)
Niveau : Critique
Mots clés : (70368744177664),(2)
Utilisateur : Système
Ordinateur : PA-Fixe
Description :
Le système a redémarré sans s’arrêter correctement au préalable. Cette erreur peut survenir si le système ne répond plus, s’est bloqué ou n’est plus alimenté de façon inattendue.
XML de l’événement :
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>6</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000400000000002</Keywords>
<TimeCreated SystemTime="2018-01-06T08:55:58.501599600Z" />
<EventRecordID>32391</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>PA-Fixe</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">307</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x501</Data>
<Data Name="BugcheckParameter3">0x500</Data>
<Data Name="BugcheckParameter4">0xfffff8017b87f370</Data>
<Data Name="SleepInProgress">0</Data>
<Data Name="PowerButtonTimestamp">0</Data>
<Data Name="BootAppStatus">0</Data>
<Data Name="Checkpoint">0</Data>
<Data Name="ConnectedStandbyInProgress">false</Data>
<Data Name="SystemSleepTransitionsToOn">0</Data>
<Data Name="CsEntryScenarioInstanceId">0</Data>
<Data Name="BugcheckInfoFromEFI">true</Data>
<Data Name="CheckpointStatus">0</Data>
</EventData>
</Event>
Voici ce qu'indique WhoCrashed :
Crash Dump Analysis
________________________________________
Crash dumps are enabled on your computer.
Crash dump directories:
C:\WINDOWS
C:\WINDOWS\Minidump
On Sat 06.01.2018 09:55:34 your computer crashed or a problem was reported
crash dump file: C:\WINDOWS\Minidump\010618-3703-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x1756E0)
Bugcheck code: 0x133 (0x0, 0x501, 0x500, 0xFFFFF8017B87F370)
Error: DPC_WATCHDOG_VIOLATION
file path: C:\WINDOWS\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: The DPC watchdog detected a prolonged run time at an IRQL of DISPATCH_LEVEL or above. This could be caused by either a non-responding driver or non-responding hardware. This bug check can also occur because of overheated CPUs (thermal issue).
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Sat 06.01.2018 09:55:34 your computer crashed or a problem was reported
crash dump file: C:\WINDOWS\MEMORY.DMP
This was probably caused by the following module: rtwlane.sys (rtwlane+0x47562)
Bugcheck code: 0x133 (0x0, 0x501, 0x500, 0xFFFFF8017B87F370)
Error: DPC_WATCHDOG_VIOLATION
file path: C:\WINDOWS\system32\drivers\rtwlane.sys
product: Realtek PCIEWireless LAN PCI-E NIC
company: Realtek Semiconductor Corporation
description: Realtek PCIE NDIS Driver 41728
Bug check description: The DPC watchdog detected a prolonged run time at an IRQL of DISPATCH_LEVEL or above. This could be caused by either a non-responding driver or non-responding hardware. This bug check can also occur because of overheated CPUs (thermal issue).
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: rtwlane.sys (Realtek PCIE NDIS Driver 41728, Realtek Semiconductor Corporation ).
Google query: rtwlane.sys Realtek Semiconductor Corporation DPC_WATCHDOG_VIOLATION
________________________________________
Conclusion
________________________________________
2 crash dumps have been found and analyzed. A third party driver has been identified to be causing system crashes on your computer. It is strongly suggested that you check for updates for these drivers on their company websites. Click on the links below to search with Google for updates for these drivers:
rtwlane.sys (Realtek PCIE NDIS Driver 41728, Realtek Semiconductor Corporation )
If no updates for these drivers are available, try searching with Google on the names of these drivers in combination with the errors that have been reported for these drivers. Include the brand and model name of your computer as well in the query. This often yields interesting results from discussions on the web by users who have been experiencing similar problems.
Read the topic general suggestions for troubleshooting system crashes for more information.
Note that it's not always possible to state with certainty whether a reported driver is responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.