http://free.avg.com/ww-en/faq.tpl-crp.num-4406
The AVG 2012 Free Edition software protects your computer on multiple levels. In case you need to disable AVG Free, please consider which part of the protection you need to switch off. The AVG parts and their purpose are:
The Resident Shield, part of Anti-Virus component, is the main component protecting you from viruses. It scans accessed files and if a virus is found, the access to the file is blocked. This applies to executing infected programs, as well as to opening of infected documents or any other files.
Disabling of the Resident Shield is sometimes recommended before installation of a new software or drivers, since it can prevent conflicts that would otherwise occur during their installation. This however applies only to limited number of specific programs and drivers, and there is no general reason why AVG Resident Shield should interfere with an installation of any application.
To disable the Resident Shield, please:
The AVG E-mail Protection may affect your sending/receiving of e-mails, since it is designed to scan the messages and needs to access them in some way. The way of accessing the messages depends on your e-mail client, but only the Personal E-mail Scanner plugin can interfere with the communication between your computer and the e-mail server.
To disable the Personal E-mail Scanner (if it is installed), please:
The LinkScanner component provides protection against websites, that are designed to install malware into your computer via the web browser or its plugins. The LinkScanner consists of two features, AVG Search-Shield and AVG Surf-Shield.
To disable the LinkScanner, please:
The AVG Identity Protection component protects you from all kinds of malware like Spyware, Bots, Identity Theft using behavioral technologies. It also provides zero day protection for new viruses. Identity Protection verifies the behavior of applications and if there is suspicious action detected (this means e.g. when file copies itself to system folder, writes data into another files and creates registry entries, gathers important data and saves them to a specific file or uploads them to the Internet...), you will get notified.
To disable the Identity Protection, please:
If you want to switch all protections level off at once:
Or: