MSFS does not start anymore (ucrtbase.dll)

I’m unable to launch MSFS (probably since last windows update). It was running well until today.

I completely uninstalled the game and reinstalled it (from steam) and when I launch MSFS no window is opening.

My graphic card drivers are up to date (Nvidia v 555.99)
My last windows update is KB5039212

In the systemps logs I have those ones :

Nom de l’application défaillante FlightSimulator.exe, version : 1.37.19.0, horodatage : 0x00000000
Nom du module défaillant : ucrtbase.dll, version : 10.0.22621.3593, horodatage : 0x10c46e71
Code d’exception : 0xc0000005
Décalage d’erreur : 0x0000000000012b7b
ID du processus défaillant : 0x0x1FBC
Heure de début de l’application défaillante : 0x0x1DABEEAB3E581F6
Chemin d’accès de l’application défaillante : C:\Program Files (x86)\Steam\steamapps\common\MicrosoftFlightSimulator\FlightSimulator.exe
Chemin d’accès du module défaillant: C:\WINDOWS\System32\ucrtbase.dll
ID de rapport : fbc7535f-1cf0-4b09-b74f-108245a3d736
Nom complet du package défaillant : 
ID de l’application relative au package défaillant : 

and :

Détecteur d'erreurs 1777245953919065338, type 4
Nom d’événement : APPCRASH
Réponse : Non disponible
ID de CAB : 0

Signature du problème : 
P1 : FlightSimulator.exe
P2 : 1.37.19.0
P3 : 00000000
P4 : ucrtbase.dll
P5 : 10.0.22621.3593
P6 : 10c46e71
P7 : c0000005
P8 : 0000000000012b7b
P9 : 
P10 :

Hi @Eynoz35 ,

Thank you for this report. We’ve moved your topic into the User Support Hub.

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Had similar problem, this is how I fixed it:

Try;

  1. Repair Gaming Services via Settings, Apps

  2. Repair FS2020 via Settings, Apps.

  3. Reboot PC

  4. Try FS

  5. If fault persists, load XBox App, my library, select FS2020, top right, grey box, three dots, press. Select Manage, select Files, select Verify and Repair (you may need to try and run FS)

  6. Reboot PC

  7. Try FS - still a problem, carry out a repair of Windows

Best of luck.

Bill.

Thanks UpscaleSmile83,

I understand that you are using the Xbox version.
I’m using the steam version so I don’t know were I can find those menus

Possible Solutions

  1. Repair Damaged System Files:
  • Run the System File Checker (SFC) and the Deployment Imaging Service and Management Tool (DISM):

bash

Copiar código

sfc /scannow

bash

Copiar código

DISM /Online /Cleanup-Image /RestoreHealth
  1. Update Windows:
  • Ensure you have the latest Windows updates. Go to Settings > Update & Security > Windows Update and check for updates.
  1. Reinstall the Universal C Runtime Library:

https://aka.ms/vs/17/release/vc_redist.x86.exe

https://aka.ms/vs/17/release/vc_redist.x64.exe

  1. Repair or Reinstall the Problematic Program:
  • If the error occurs when using a specific application, try repairing or reinstalling it.
  1. Malware Scan:
  • Run a full system scan with your antivirus software to ensure there are no infections.

Hi @ToniGsxr600,

I tried all of them and I still get the same windows error at startup :frowning:
I also tried to reinstall Steam, MSFS, VisualC++ Redistribuable, My Graphic card drivers.
I also Uninstalled+Reinstalled the latest windows update…

From the windows events it seems that the error is linked to ucrtbase.dll but I don’t find any interesting post about it.

try;
sfc /scannow
DISM.exe /Online /Cleanup-image /Restorehealth
google for it how to do,good luck

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I retried once more in case it would magically fix the bug this time, but unfortunately it’s still not working.

I have a PC.

I don’t know if this will resolve your problem, but I saw a recent video stating that the NVidia 555.99 driver had multiple issues. Since you’re kind of out of options at this point short of a rebuild, you might want to back off that version and see if that helps. Good luck.

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I had no option to rollback the last NVIDIA driver update as explained on their site. The button was disabled :sleepy:

I finally re-installed windows and msfs can start now… Hope it will still run after next windows reboot :sweat_smile:

Thanks all for your help

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