Uninstall the AVG that is on your PC that has expired - then download the free version and install it with a clean install. When installing be careful what you click on so that you do not install any browser tool bars, etc. which seems to be the norm with most free software downloads lately. I have AVG on one computer and AVAST on another - both are free and both work well. Both have paid versions that are in bold download fonts to lead you away from the free versions which are in small print somewhere near the bottom of the page. I prefer the AVAST but it did not play nice with the firewall on one of my computers and AVG did.