So, I ran a boot-time scan, and while the scan found no virus, itĭid give me about 5 notifications in a row which I quickly, and sloppily, wrote down. Avast! has an option called boot-time scan, which allows you to scan before malware or viruses have the chance to activate. So, I use Avast! Free Antivirus 2015 for my computer antivirus. Hello and good day! I will try to be as direct as possible.