Medium
Operating Systems
✓ Solution Verified by Community (0+ upvotes)
How to fix error error-invalid-exe-signature in Windows 11
ERROR_INVALID_EXE_SIGNATURE = 191
Fix based on community reports and expert analysis. Last verified: 2026-08-12
· How we verify fixes
| Error Code | error-invalid-exe-signature |
|---|---|
| Affected System | Windows 11 (Microsoft) |
| Difficulty | Medium |
| Estimated Time | 20 min |
Solution Steps
- 1 First, verify the file's signature. Right-click the executable file, select Properties, go to the Digital Signatures tab. Check if the signature is valid. If it says 'This digital signature is not valid', the file is likely corrupted or tampered with.
- 2 If the signature is invalid, re-download the file from the official website. Delete the old file and download a fresh copy. This ensures you have a properly signed version.
- 3 If the program is from a trusted source but the signature is expired, you can temporarily bypass the check by right-clicking the file, selecting Properties, and checking 'Unblock' if it's blocked. Then click Apply and OK.
- 4 If you are a developer and this is your own unsigned executable, you can sign it using a code signing certificate. For testing, you can disable signature enforcement temporarily by pressing Windows key + R, typing 'gpedit.msc' (if available), and navigating to User Configuration → Administrative Templates → System → Specifies additional programs that are allowed to run. But this is not recommended for regular users.
- 5 As a last resort, you can run the program in Safe Mode. Restart your PC, press F8 (or Shift + Restart) to boot into Safe Mode, and try running the program. If it works, the issue might be with other software interfering.
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