To Replace Expired Antivirus Software, you have to Click on the pop-up message in the lower right-hand corner if you get one that states your antivirus subscription is about to expire. You need to follow the steps on-screen. After that, remove the antivirus software completely if the subscription is expensive or if you do not want to go with the same company. To do this go to the Control Panel, you must pick "Add or Remove Programs" and look for the antivirus software. You can sometimes remove it with choosing "Uninstall" from the Start Menu. To do this, you have to go to "Start," "Programs" and pick your current antivirus program to see if there is an uninstall command in this menu. Then, add a new antivirus program once the old one is removed from your computer. Next, consider using AVG, CA, Norton, TrendMicro and McAfee virus programs. Forth, download the updates immediately and restart your computer. You need to run a virus scan. You must make sure and set it up so that it will scan your computer every week automatically.