If your trial license has expired, then the message “
Your computer security is at risk. Trial license validity period has expired.” will appear in the main application window above the
Computer Protection section:

If notifications about license validity are enabled, then you will also see the following pop-up window The license validity period has expired
In order to purchase a commercial
activation code for
Kaspersky Pure R2, perform the following:
The computer on which Kaspersky Pure R2 is installed should be connected to the Internet.
A page with the following content will be opened in your browser:

Prices are in US dollars.
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Find Kaspersky PURE R2 and select the appropriate options for the license (PC, Year) and then click “Buy Now”.
After that you will be redirected to your Shopping Cart. Follow the instructions and make your purchase. After your purchase processes you will get an email with an activation code for Kaspersky PURE R2.
You do not need to remove the expired trial. All you will need to do is activate your Kaspersky PURE using the activation code.