Recently, I help a client of my to install Karpersky Internet Security 2010. To enjoy an extra 1 month of protection using Karpersky Trial Version License key. After 30 days the license key expire, my client call me on where to key in the License key. I check on the Karpersky Interface, it is really quite hard for me to find it too. So below is how and where the location for you to key in the License key.
Step1: press the main menu to go to main control center.
Step 2: go to the right lower corner and click on the link show on the picture below.
Step 3: After clicking you will see the below image and click on " Activate the application with the commercial license"
Step 4: then you will see the space for you to key in your activation key. Click next a few times, then the Software will be activated.