Installation and Performance of Free AVG Internet Security
The installer for the free AVG internet security package is available on the AVG free website or on the trial/download page of AVG.com. The installer lets you customize the package, but you can simply use the standard installation method. An AVG Security toolbar is offered but optional, whether you choose the custom or standard installation.
A reboot is required after installing AVG and it will disable Windows Defender application, if found installed or running in XP, Vista or Windows 7. There is also an option to either continue to use the Windows Firewall or allow AVG to disable it and use the firewall in the AVG internet security program. A program updater is built-in and you can schedule the updates and scans.
A scan optimization is also offered by AVG after the reboot of Windows. Allowing the optimized scanning will let AVG find trusted files so they're not scanned again whenever you run a computer scan. Note that running optimization scanning using AVG does not actually look for viruses or any type of malware. You will need to run a computer scan to check your system for any infections.
AVG's memory usage is acceptable but if you happen to find a performance issue using the program, check-out the troubleshooting article, "Is Your Computer Running Slow After AVG Installation?"
Like other malware scanners, a false positive can happen during a scan. Below is an example of a false detection by AVG: You don't have to panic because AVG is configured by default to keep a copy of detected threats in the virus vault (also known as the quarantine manager), where you can easily restore the false detection. Also see, "How to Recover a File AVG Has Deleted"