All Unreal Engine' game crash at startup : Fatal Error

Hello,

Since 3 days, I’m searching to resolve crash issues on all UE4 games, for exemple Mordhau or Valorant. When I launch a game it instantly shutdown and I get the “Fatal Error” message.

Here some usefull informations :

  • I didn’t had this issue before, and I don’t know what is the cause of the problem because I recently updated Windows and installed a RTX 3090 OC from Asus Rog (I had 2080ti before). I also have i7 9700k and 16 GB DDR4 mem. I would be happy if I could avoid factory reset (And I saw it didn’t worked for some persons)

  • I have a BeQuiet PSU / 750w gold. I don’t think it’s the cause of the problem because I performed a stress test with aida64 (all component checked + GPU Overclocked) and it only took around 600w.

  • I tried to downclock my GPU with GPU Tweak 3 but it didn’t worked

  • I have Windows Familly 10 version 21H1 build 19043.1151Experience Windows Feature Experience Pack 120.2212.3530.0

  • I tried to deleted UE4 config files in %AppData%, didn’t worked as well

  • I have disable all security (Windows Defender)

  • I have reseted BIOS configuration to be sure there is no overclocking (Asus Rog Strix Z390 E).

  • I tried to read crash report with winDBG (UE4 minidump) but can’t read the file as regular text.

I only see on internet fix for specific games but no fix for every UE4 games, plus thoose fix are not always reliable.

The weird thing is when I start my computer in the morning and all games works fine (as if UE know that my PC is cold). I tried to reboot my computer to test and bim, It doesn’t work anymore even If I reboot or try steps I mentioned upper.

Do anyone have an idea ?

Thanks