I have 2 question

[poppie]

  what is the differences between web shield and network shield?
  is heuristic scanning only available in pro version?
thanks

[DavidR]

What is avast Help File:

Web Shield provider protects your computer from viruses that may infect your computer when browsing the Internet - especially when downloading files from web pages.

If you - possibly by mistake - download an infected file and try to start it, avast! will prevent the infection thanks to its Standard Shield provider (which scans all files that you start of open). With Web Shield, however, the virus will be detected even sooner - during the download of the file. So, Web Shield makes your computer even safer than before.

Network Shield provider protects your computer from Internet worm attacks. It works similarly to a firewall, even though it does not fully substitutes it. The Network Shield does not require any user interraction.

With the latest version of avast, the Network Shield also blocks access to known malicious sites.

Heuristic scanning is only in the anti-rootkit module and partially in the Internet Mail scanner and that is the same in both Home and Pro versions. avast also uses generic and algorithmic signatures.