How to run a scan and delete infected files with Avast To run a scan with AVAST, first open the program by double clicking on the program icon. In the overview tab, click on the option “Smart Scan” to detect possible threats to your computer. AVAST automatically starts to analyze your system for viruses and malware, check for necessary software updates and add-ons in your browsers, and identify potential security problems within your home network and other potentially harmful elements. After the analysis is done, the system will indicate if any issues have been found. Should this be the case, click on the button “Resolve All” The next screen will give more details on the problems detected. If the system finds any “evidence of Grime” on your PC, clicking on the “Activate” button will give you the option to buy “Grime Fighter “, a service tool used for system optimization. If you do not want to buy this service, simply close the window and click “Skip” to finish the process. After the completion of the Smart Scan you can choose to “Rescan” or simply close the program.