Rust "Untrusted System File" error: how to fix it
Written by
Last checked
September 25, 2026
Rust shows an "Untrusted System File" error.
Also appears as: Untrusted System File, rust untrusted system file, rust eac untrusted system file
Facepunch says the game loaded a system DLL that failed an integrity check, which indicates system-level corruption on your own PC. Facepunch also says it can indicate a virus infection.
Fix it, step by step
Run sfc /scannow as administrator
Run
sfc /scannowin a command prompt opened with administrator rights. Facepunch says this fixes it in most cases.Run a full antivirus scan
Run a full antivirus scan; Facepunch says the error can also point to a virus infection.
Install all available Windows updates
Install all available updates through Windows Update.
Sorted. Glad that worked.
Nothing worked. Here's what to do next.
You've ruled out every step on this page, which is useful. Send this to support or drop it in the community Discord so nobody makes you repeat yourself.
Hit this error? Leave a comment
Say where you are, what you see on screen, and whether any fix worked for you.
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What people are saying
Notes from players who've hit this one — no time limit, an answer from months ago is still an answer.
- Nothing reported here yet.
From isthisgamedownMatched on ""
From isthisgamedownMatched on ""
From isthisgamedownMatched on ""
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