Error "Installation files are not signed”

Latest update: August 05, 2022 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 Technical Support

 
 
 
 
 
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