1. Remove Kaspersky Internet Security 2018. If you are not sure how to remove the application, see this guide.
  2. Restart your PC.
  3. Download the installer from the Kaspersky Lab website.
  4. Follow the instructions to install Kaspersky Internet Security 2018.

For More Information: https://www.800-customerservicenumber.com/kaspersky-antivirus/