The .daa file extension (Direct Access Archives) is the format created by PowerISO much similar to large ISO files. It is commonly used because it compresses original data, can be password-protected and is able to be split into smaller parts. The .daa files are most commonly used online to distribute large files on the internet through P2P downloads or through the bittorrent network. Even though PowerISO is free to use as trial, it has limits regarding how big file size you can open with it. » Read more: Extract and Open .daa Files without using PowerISO
Kaspersky Antivirus recently announced the release of Kaspersky Antivirus 8.0.0.1015 which will be available for Windows 7. This release is only meant as a technical preview but it will be able to provide sufficient protection against malicious viruses once Windows 7 Public Beta is released. As stated in the Kaspersky Press-Release, the technical preview is a complex solution for securing computers running under Windows 7. The prototype includes not only an antivirus component but an effective and fully functional firewall and anti-spam filter.