Avast! Antivirus is a program developed by "Avast!" a software developer that makes programs centered around computer security. Their antivirus program, also called "Avast!" comes in both a free edition and a pro edition. The free edition contains basic antivirus and anti-spyware scanning while the pro edition has a number of additional features, such as anti-rootkit technology.
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Both the free version, and the pro edition will run on any of the following operating systems: Microsoft Windows 2000 Professional, Microsoft Windows XP (any Edition, 32-bit or 64-bit), Microsoft Windows Vista (any Edition, 32-bit or 64-bit), Microsoft Windows 7 (any Edition, 32-bit or 64-bit) and Mac OS X 10.4 Tiger or Mac OS X 10.5 Leopard.
The hardware system requirements for "Avast! Free Antivirus," "Avast! Pro Antivirus" and "Avast! Internet Security" are the same:
Processor: Pentium 3 Memory:128 MB RAM, Hard Drive Space: 100 MB
The requirements for "Avast! Mac Edition" are as follows: Operating System: Any Intel-based Mac, Mac OS X 10.4 Tiger or Mac OS X 10.5 Leopard Memory: 128 MB of RAM (256MB preferred) Hard Drive: 50 MB of free hard disk space.
Previous versions of Avast! need to be uninstalled before installing any Avast! 5.0 product. The installer for 5.0 will detect and uninstall previous versions if they are still on your computer when running installation.