avast! Free Antivirus

avast! Free Antivirus is here again with more of what makes it the world's most widely used antivirus. We've made improvements to its Behavior Shield and Remote Assistance, improved the cloud technologies and the energy-saver settings. And we've simplified the UI and added a Software Updater for easily keeping the eye on all your potential vulnerabilities. Plus, there's a Browser Cleanup tool for removing pesky toolbars and plugins.