Unless you update your antivirus software, recently released viruses can avoid detection on your computer. The system may be telling you that your computer is safe while some new virus may be wreaking havoc. You can protect your computer with regular updating.

Avast Antivirus software is a free antivirus program that has received positive reviews from both PC World and CNET. It can be downloaded from the Avast website. Read on to learn how to use Avast Antivirus.

Freeware and Shareware are programs that are released for public use by coders who either developed them privately or adapted them from existing software, removing bugs and inefficiencies that can often only show up after lots of road testing. The software is completely legal and free, and available from a number of download sources.

CA Anti-Virus, formerly known as EZ Anti-Virus, is solid antivirus software designed for business computers, servers, and PDA. However, it offers no firewall, e-mail protection or anti-spyware coupled in with the deal. The lack of automatically removing malware is perfect for someone looking for a no-hassle, timed-scan-and-remove-only antivirus software.

A rootkit is a set of utilities which can run hidden on a computer system, often with the intention of providing secret access to (and control over) the computer's operating system. Usually hackers, viruses, worms and other malicious entities use rootkits to hide their presence on infected systems.

Virus scanners operate by searching your harddisk(s) for files which might be infected by a virus. This method is never 100% secure, since only known viruses (or known virus patterns) are detected. If an infection has been detected in a certain file, the virus scanner might be able to clean the file, but very often this is not the case. In that case, you can try another scanner to clean the file, you can try to replace the file or - as a last resort - delete it.

Description: AVG is a 100% free antivirus program that offers real time protection, on demand scanning, and email scanning. It also features automatic updates and a very small footprint that will not slow down your system. It does exactly what it promises and does it really well.

Description: Accelman is a dual-pane "File Manager" with a wide set of features ranging from multiple file management panes to a full-featured image viewer and editor, archiver with support of 15+ formats, media player and playlist editor, as well as a host of file and folder management tools.

Description: the new Radiohead music video for their song "House of Cards" was created using a technology that captures 3D images as data, without cameras or lights. A version of the video was released on the Google code page, which allows you to manipulate and move in or around the objects as the video is playing using a 3D viewer. You can also download and modify the data to come up with your own version of the video.