As AVG 8.0 is an Anti-virus AND an Anti-spyware product , previous version/s of both AVG products must be removed from your pc first , in order to complete a successful installation. You can do this manually using add/remove programs , however it's much easier done by downloading the AVG 8 installation file from ourstanley's post above and running the file. During the installation process you will get the choice to allow the set up to automatically remove the older versions for you. Once the set up is complete your pc will require a reboot after which it's advised to check for updates to the program.