Error "Installation files are not signed”

Latest update: April 04, 2023 ID: 11004

When installing a Kaspersky application, you may receive the error message “Installation files are not signed”.

This error might be caused by a malicious program that adds certificates of the protection solutions to the Untrusted Certificates folder. This prevents anti-virus programs from installing and launching.

Follow the steps below to solve the issue.


Step 1. Check the system date on your computer


Step 2. Check the digital signature of the installer


Step 3. Check for the latest Windows updates


Step 4. Check if required root certificates are installed (applicable to Windows 7 and Windows 8)


Step 5. Update Windows root certificates


Step 6. Remove malware from your computer


Step 7. Check if there are any Kaspersky certificates in the Untrusted Certificates folder


Step 8. Contact Customer Service

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