Anti-virus software helps the system to eliminate undesirable viruses and malicious worms. Anti-virus software can be used to identify viruses. It also stops the bugs from attacking the system. The virus can affect the whole system such as erasing the files or using a system to affect another system. So it’s essential to install antivirus software on the computer.Here is a list of top 5 best free antivirus software.Avira Anti-virus is a free antivirus software for Windows. It can be easily installed and also provides many additional features. Avira can be used to detect various types of viruses. It also delivers security from Trojan Horse. It has a simple interface and is user-friendly. The software automatically updates and keeps itself up to date. It supports Windows 7, 8, 10, XP and also Windows Vista. In addition to this, Avira can be used for both phone and PC.AVG stands for Anti-Virus Guard. It is a free antivirus software and has a simple yet modifiable interface. AVG software also contains file shredder. This file-shredder feature in AVG can be used to erase any item or even erase an entire folder. The updates are done automatically and are kept up to date. It supports Windows 7, 8, 10, XP, Vista and Windows 2000. It delivers good malware protection. AVG does not contain game mode which is a feature available in Avira.Avast is a free anti-virus software. It can be used to provide security to the system from unsolicited threats. In addition to this, Avast can identify various types of viruses and remove it. It also provides resident protection. Avast is a freemium software and includes many features in the free version also. Furthermore, the software has over million users in the whole world. Avast delivers better malware protection than most of the free anti-virus software. The software can be updated from time to time.Bitdefender is a free anti-virus software. It is a freemium software, hence requires to be paid for accessing more number of features. Bitdefender offers brilliant malware protection. It can easily identify viruses and erase them. Bitdefender also has full-time technical support. The only drawback of this software is the absence of VPN. The software automatically updates itself and is kept up to date. It also supports Mac operating system.Panda is a free anti-virus software. It can be used to detect unwanted threats and destroy it. Panda Anti-virus prevents and detects viruses. It is a freemium software. The paid version provides additional features. Panda Anti-virus delivers good malware protection. Furthermore, it provides resident and on-access protection. In addition to this, Panda Anti-virus also contains game mode which is not available in Anti Virus Guard (AVG) software.