To install AVG Internet Security, follow these steps:

Go here to activate your SALES NUMBER and receive the AVG email with the LICENSE CODE to use on the PC
Click here to download AVG Internet Security.
Right-click the downloaded setup file and select Run as administrator from the context menu.
In the User Account Control dialog, click Yes to allow AVG to make changes to your PC.
Select your preferred language from the drop-down menu, then click Continue.
Type your license number and click Install now.
Click Scan now to begin using the program.

 
If you are using a trial version of AVG Internet Security or your paid license has expired, you can activate the product via the AVG Internet Security interface.

Open the AVG Internet Security interface.
Click Help, then select Activate product from the drop-down menu.
Type your license number into the Product key field and click Next, then click Finish.