Avira AntiVir Personal is for personal use only and free of charge. Like much antivirus software, it can run a scan to check disks for malware, and can also run as a background process which checks every file opened or downloaded. It can detect and possibly remove some rootkits. It updates its virus definitions over the Internet, daily by default, also opening a window with an advertisement suggesting that the user purchase Avira AntiVir Premium or Avira Premium Security Suite. Avira updated all its products to version 10.0 in March 2010.
Avira offers a rescue CD image which may be downloaded as an ISO file free of charge and used to write a bootable CD. The CD has its own Linux-based operating system so it does not depend on the host PC's[6]; it can be used to clean an unbootable PC, and may be able to find malware which uses the host's operating system to hide (e.g., some rootkits). The CD image contains the AntiVir program and the virus database current as of the time of download; it boots the machine into the AntiVir program, then scans for and removes malware, possibly also restoring normal boot and operation.
Avira AntiVir Premium has several improvements over the free version, including:
Email scanning (POP3 and SMTP)
WebGuard to block access to malicious sites
Avira AntiVir Premium Security Suite has some more improvements over both versions, including:
Anti Spam for E-mail
Firewall blocks hackers
Backup System to protect and secure important data
AntiBot prevents dangerous botnets from taking over your system
Parental Controls blocks unsuitable websites for Children and Teens
No antivirus software can detect all malware, particularly new versions; known viruses can be detected by characteristic file or memory content, and programs capable of carrying out suspicious but sometimes legitimate activities such as finding passwords or terminating processes can be flagged for attention.
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