avast! Antivirus is a complete ICSA certified antivirus package for small office home office use - SOHO.
Protect your system and valuable data against computer viruses with Avast! Professional Edition.
avast! 4 Professional Edition is a collection of award winning, high-end technologies that work in perfect synergy, having one common goal: to protect your system and valuable data against computer viruses. It represents a best-in-class solution for any Windows-based workstation. This page demonstrates its most important features and provides links to further resources.

- For a computer running Windows 95/98/Me: 486 Processor, 32MB RAM and 50MB of free hard disk space.
- For a computer running Windows NT 4.0: 486 Processor, 24MB RAM and 50MB of free hard disk space and Service Pack 3 (or higher) installed
- For a computer running Windows 2000/XP Workstation (Not Server): Pentium class Processor, 64MB RAM (128MB recommended) and 50 MB of free hard disk space
- For a computer running Windows XP 64-bit Edition: An AMD Athlon64, Opteron or Intel EM64T-enabled Pentium 4 / Xeon processor, 128MB RAM (256MB recommended) and 50 MB of free hard disk space
- For a computer running Windows Vista: Pentium 4 processor, 512MB RAM and 50 MB of free hard disk space
- The program itself requires about 20MB of hard disk space; the remainder of the recommended space is reserved for the virus recovery database file and its index (VRDB, also known as the "integrity database" from the previous version).
- A functional MS Internet Explorer 4 or higher is required for the program to work.