AVG is an umbrella term for a range of antivirus and internet
security software for the Microsof Windows, Linux, and FreeBSD computing platforms, developed by AVG Technologies. A signature update dated November 9 2008 crippled Windows Machine as it allowed the software to think "User32.dll", a major component of Windows XP/vista, was a trojan and advised users to delete it. Users who deleted the file in question were put on a continuous reboot loop. The problem was rectified a few days later with a new signature database ,AVG features most of the common functions available in modern antivirus and Internet security programs, including periodic scans, scans of sent and received emails (including adding footers to the emails indicating this), the ability to "repair" some virus-infected files, and a "virus vault" in which infected files are held (A quarantine area; also known as a "virus chest").
AVG Anti-Virus Free Edition:
According to AVG Technologies, over 80 million users have AVG Anti-Virus protection, including users of the Free Edition. On April 24, 2008, AVG released AVG Anti-Virus Free Edition 8.0. Along with a more colorful interface, the new program added some new features – a combined Anti-Virus and Anti-Spyware protection engine, LinkScanner Search-Shield safe search protection, plus the AVG Security Toolbar – which were previously only available in AVG commercial versions. 
There are some limitations with AVG Anti-Virus Free Edition 8.0 compared to the commercial versions of AVG products. These limitations include:
Less protection – AVG Anti-Virus Free Edition 8.0 provides the same anti-virus and anti-spyware scanning engine as the commercial product; however, it lacks anti-rootkit. The older 7.5 Free Edition is perfectly capable of finding and disabling rootkits based on signature, but cannot scan for rootkit-like activity. Also, it does not provide safe surfing (drive-by download) protection. While there is no official protection for files from messaging sources, the Residen Shield component automatically scans files before they are opened or copied.
Infrequent updates – AVG Anti-Virus Free Edition 8.0 receives updates via a lower priority service. Priority updating via high-speed servers is only available for the commercial versions of AVG products.
No telephone or e-mail technical support – There is no telephone or e-mail technical support provided by AVG for users of AVG Free Edition products anywhere in the world. AVG Free Edition users have access to support via the self-help AVG Free Forum.
Less customization – Scheduling options in AVG Anti-Virus Free Edition 8.0 are very limited (only one scheduled update per day, one scheduled scan per day etc.). However, the AVG Resident Shield configuration allows exclusions. The on-demand/scheduled scanner allows advanced testing options such as heuristics and reporting of password-protected archives reporting. Process priority for on-demand/scheduled scans can be dynamically adjusted over three different configurations.
No server support – AVG Anti-Virus Free Edition 8.0 cannot be installed on server operating systems (such as Windows Server 2003), nor can it be used for the scanning of network drives.
AVG Anti-Virus Free Edition 8.0 is only licensed for home and non-commercial use on a single computer.
AVG Free Edition was once responsible for popup ads advertising the non-free versions of AVG Anti-Virus 8.0 and AVG Internet Security 8.0, which claim to provide more comprehensive levels of protection. Current free versions display only in-program banner ads for the full edition; not popups
There are some limitations with AVG Anti-Virus Free Edition 8.0 compared to the commercial versions of AVG products. These limitations include:
Less protection – AVG Anti-Virus Free Edition 8.0 provides the same anti-virus and anti-spyware scanning engine as the commercial product; however, it lacks anti-rootkit. The older 7.5 Free Edition is perfectly capable of finding and disabling rootkits based on signature, but cannot scan for rootkit-like activity. Also, it does not provide safe surfing (drive-by download) protection. While there is no official protection for files from messaging sources, the Residen Shield component automatically scans files before they are opened or copied.
Infrequent updates – AVG Anti-Virus Free Edition 8.0 receives updates via a lower priority service. Priority updating via high-speed servers is only available for the commercial versions of AVG products.
No telephone or e-mail technical support – There is no telephone or e-mail technical support provided by AVG for users of AVG Free Edition products anywhere in the world. AVG Free Edition users have access to support via the self-help AVG Free Forum.
Less customization – Scheduling options in AVG Anti-Virus Free Edition 8.0 are very limited (only one scheduled update per day, one scheduled scan per day etc.). However, the AVG Resident Shield configuration allows exclusions. The on-demand/scheduled scanner allows advanced testing options such as heuristics and reporting of password-protected archives reporting. Process priority for on-demand/scheduled scans can be dynamically adjusted over three different configurations.
No server support – AVG Anti-Virus Free Edition 8.0 cannot be installed on server operating systems (such as Windows Server 2003), nor can it be used for the scanning of network drives.
AVG Anti-Virus Free Edition 8.0 is only licensed for home and non-commercial use on a single computer.
AVG Free Edition was once responsible for popup ads advertising the non-free versions of AVG Anti-Virus 8.0 and AVG Internet Security 8.0, which claim to provide more comprehensive levels of protection. Current free versions display only in-program banner ads for the full edition; not popups
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