Fix Invalid Signature Error 0x800b0109

How to Fix Invalid Signature Error 0x800b0109
The 0x800b0109 error, often accompanied by a message like “A certificate chain processed, but terminated in a root certificate which is not trusted,” is a common Windows error related to digital signatures and trust. This issue typically occurs during a software installation, a Windows update, or when running a program, indicating that a file’s digital signature cannot be verified. This can happen due to a corrupted certificate store, a missing DLL file, or a security conflict.

This guide will provide a series of effective solutions to resolve this error by fixing certificate issues and repairing system files.

Understanding the Error 0x800b0109
This error code is a clear signal that the system is unable to verify the authenticity of a file. The primary causes are:

Corrupted Certificate Store: The Windows certificate store, which holds trusted root certificates, is damaged.

Missing or Unregistered DLL Files: Critical dynamic link library (DLL) files required for signature verification are either missing or not properly registered.

System File Corruption: Essential Windows system files are damaged, which can interfere with security checks.

Outdated Security Components: The security components responsible for verifying digital signatures are not up to date.

Step-by-Step Solutions
Solution 1: Re-register Essential DLL Files
Sometimes, the DLL files responsible for cryptographic services and security are not properly registered.

Press the Windows key + R, type cmd, and press Ctrl + Shift + Enter to open Command Prompt as an administrator.

Type the following commands in order, pressing Enter after each one:
regsvr32 Softpub.dll
regsvr32 Wintrust.dll
regsvr32 Initpki.dll

You should receive a “DllRegisterServer in [filename] succeeded” message for each one.

Restart your computer and try the action that was causing the error again.

Solution 2: Run the System File Checker (SFC) and DISM Tools
Corrupted system files are a common cause of signature verification errors. The SFC and DISM tools can help repair these.

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Type the following command and press Enter:
sfc /scannow

Wait for the scan to complete.

Next, run the DISM tool to repair the system image:
DISM /Online /Cleanup-Image /RestoreHealth

Restart your computer after both scans are finished and try the action again.

Solution 3: Check for Correct Date and Time
An incorrect system clock can cause issues with digital certificates, as they have expiration dates.

Right-click on the clock in your taskbar and select “Adjust date and time”.

Ensure that “Set time automatically” and “Set time zone automatically” are both turned on.

If they are already on, turn them off and on again to force a resync.

Restart your computer.

Solution 4: Manually Install the Root Certificate
In some rare cases, a specific root certificate may be missing.

Use a web browser to download the missing root certificate from a trusted source, such as a major Certificate Authority (CA) website.

Double-click the downloaded .cer or .crt file.

In the Certificate window, click “Install Certificate…”

Select “Local Machine,” then “Place all certificates in the following store.”

Click “Browse,” select “Trusted Root Certification Authorities,” and click OK.

Click Next and Finish.

Sıkça Sorulan Sorular
Q: Could a third-party antivirus cause this error?
A: Yes. Some security software can interfere with the verification of digital signatures. Try temporarily disabling your antivirus and firewall, and then run the program or update that was causing the error.

Q: I get “DllRegisterServer failed” messages. What’s wrong?
A: This indicates a deeper problem with file permissions or system file corruption. Try running the SFC and DISM tools (Solution 2) before attempting to re-register the DLLs again.

Q: Does this error mean my computer has a virus?
A: Not necessarily. While malware can cause this error, it’s more often a symptom of corrupted system files or an issue with your system’s trust store. However, running a full antivirus scan is always a good idea.

Çözüm
The 0x800b0109 error is a security-related issue that can be frustrating, but it is often fixable. By re-registering essential DLL files, repairing system integrity with SFC and DISM, and ensuring your system’s date and time are correct, you can resolve most causes. If the problem persists, it may be necessary to manually install a missing certificate or investigate third-party software conflicts.

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