This can be caused by several factors. To fix it, you can try to check your system date. Try to keep your computer data synchronized over Internet. Also, you can reset your Internet settings from Internet Explorer. To do this, open the application, go to Tools > Internet Options > Advanced tab and click Reset. It is recommended to check Windows Firewall to make sure that the Kaspersky application can connect to the update server. If you still experience problems with the update process, try contacting the developer from your account on the official website.