Fallout 4 — How to Fix "Crash on startup"
Crash on startup in Fallout 4: the fix path, and when it is grounds for a refund.
Last updated 2026-09-25 · evergreen reference
If Fallout 4 is failing with "Crash on startup", this page tells you which fixes are worth your time and when you should stop troubleshooting and go to the store instead. The causes are specific, so the fixes are too.
What the error looks like
Confirm you are dealing with the same failure.
Recognising "Crash on startup"
Fallout 4 closes before reaching the main menu, or crashes at the menu with no error message.
Why it happens
The cause determines the fix.
Cause 1
Mod incompatibility after the next-gen update, which invalidated a large number of previously stable mods — not all have been patched since.
Cause 2
A load order problem: a missing master file, or a corrupted texture being loaded at startup.
Cause 3
Missing Visual C++ or legacy DirectX components, which produces launch crashes before the menu appears.
Cause 4
On modern NVIDIA hardware, certain effects settings interact badly with PhysX-based simulation.
Fixes, in the order that works
Cheapest and most reversible first.
Disable all mods and test vanilla
Use the launcher or your mod manager to disable everything. If the game starts, re-enable one at a time, testing after each. The last one enabled before the crash returns is the culprit — update it, find a compatibility patch, or drop it.
Turn Weapon Debris off
Weapon Debris uses NVIDIA PhysX particle simulation and is associated with crashes on many modern GeForce systems. It is the highest-value stability change in the graphics menu.
Install both Visual C++ architectures and legacy DirectX
Visual C++ 2015-2022 in both x64 and x86 from Microsoft, plus the DirectX End-User Runtime Web Installer for the DirectX 9 and 11 components Fallout 4 depends on. Restart afterwards.
Cap the frame rate to 60
Fallout 4’s physics is tied to frame rate, and startup instability on high-refresh displays is common. Use the NVIDIA or AMD control panel to set a 60 FPS cap for Fallout4.exe, or install the High FPS Physics Fix mod for higher targets.
Check for broken PreVis data
If you see flickering objects or buildings disappearing alongside the crashes, set bPreCulledObjectsEnabled=0 and bUseCombinedObjects=0 in Fallout4.ini to confirm a PreCombine problem, then fix your load order so Boston FPS Fix or PRP loads after the Unofficial Patch but before worldspace mods.
How to confirm it is fixed
One successful launch is not proof.
Retest properly
Start a new game as well as loading an existing save. Crashes that only affect one save point at a corrupted save rather than the installation.
When to ask for a refund instead
Troubleshooting has a deadline.
Know the window
Steam refunds within 14 days of purchase and under 2 hours of playtime, and documented technical faults are sometimes accepted past that. Microsoft Store and Epic follow similar rules with store-specific exception paths.
Evidence changes outcomes
Attach crash logs, a DxDiag and the steps you already tried. A denied refund can sometimes be overturned when you can show the game is genuinely unplayable rather than simply disliked.
Bans are not refundable
If the failure follows an anti-cheat ban or a modified online client, no store will refund it. That is a separate category from a game that will not run.
Related pages
This is an independent player reference and is not official documentation for Fallout 4. GameFixPro does not host or link to copyrighted assets. Modding guidance is for single-player use only — never use mods in online multiplayer. Verify current requirements, prices and policies with the publisher before acting.