How to remove viruses from your computer before installing a Kaspersky application


General articles: Before installation


How to remove viruses from your computer before installing a Kaspersky application

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Latest update: February 09, 2021 ID: 12781

This article concerns:

  • Kaspersky Internet Security
  • Kaspersky Anti-Virus
  • Kaspersky Total Security
  • Kaspersky Security Cloud
  • Kaspersky Small Office Security
  • Kaspersky Free
  • Causes

Causes for the errors may be the following:

  • Another antivirus solution installed on your computer.
  • Remaining files of deleted antivirus applications.
  • Malware infection.

In case of an error, the wizard will prompt you to download and run the Kaspersky Virus Removal Tool to eliminate the risk of virus infection.  

If the issue persists, follow the steps below.

The following errors may occur during installation of a Kaspersky application:

  • Installation does not start. Nothing happens when you run the installer. 
  • Errors occur during installation:
    • Error 1304.
    • Active infection: Failed to install a Kaspersky Lab product. Your computer might be infected. For information, see this article.
    • The application was not installed. Your computer may be infected by viruses. For details, see this article.


  • Your computer is currently infected with malware which prevents the installation.
  • Another antivirus solution is installed on your computer.
  • There are files of earlier Kaspersky application versions remaining on your computer. 


  • Scan your computer for viruses using:
    • Kaspersky Virus Removal Tool. For instructions, see this article.
    • Kaspersky Rescue Disk. For instructions, see this article.
  • Uninstall an incompatible antivirus solution and try installing a Kaspersky application once again. See the guide below.
  • Delete the remaining files of earlier versions of the application. See the guide below.

If the one of the solutions above helped, after successful installation of a Kaspersky application run a full virus scan. See the guide below.

If the issue persists, contact Kaspersky technical support. See the guide below.


How to uninstall an incompatible antivirus solution


What to do if you can't update your Kaspersky application to the latest version


Recommendations after successful installation


What to do the issue persists

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