If you are running Windows 10:

1. Search for Create a restore point using the search bar and click on the result.

2. In the System Properties window on the System Protection tab, click Create.

3. Enter the description for the restore point and click Create.

4. When the restore point is created, click Close.

If you use one of the earlier operating system versions, click the link to view the guide on the Microsoft support website:

• Windows XP
• Windows Vista, Windows 7, or Windows 8

After you create a restore point, make sure you have a 20-digit activation code for your Kaspersky Lab product. You will need to enter it after you reinstall the application.

The code contains Latin letters and numerals divided into four groups of 5 characters.

If you bought the product offline in a box, you will see the activation code on the Quick Start Quide you find in the box.

If you bought the product online, the activation code will be in the e-mail from the online store.

If you lost the activation code, restore it using the guide in this article.

Delete all the remaining files of earlier application versions using the  kavremover tool. For instrcutions, see this article.

Install the application once again. For installation guides, see these articles:

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

If the issue persists, contact Kaspersky customer service by choosing the topic and filling out the form.