I have used avast anti virus for 6 months. Its better to purchase the authentic software product from store or online, do not use the cracked version, these versions do not update
the current state of virus and new database for virus or malware. The software is easy to install. However I found that this anti virus program is making my computer very slow
by consuming lot of CPU memory. It also uses large bandwidth to download the latest databases and updating the software. It does not scan external drives. I did not like the antivirus as it does not give end to end protection.