Computer virus, is the preparation of computer programs or computer functions to insert the damage or destruction of data, affect computer use, and a group of self-replicating computer instructions or program code. Found that the virus from the current point of view, the main computer is infected with virus symptoms are: 1: As the virus itself or as part of the operating system used to hide bad clusters, bad disk clusters somehow increased. 2: As the virus attached or inserted in the executable in the middle of the head and tail, so that the executable size increased. 3: As the virus to their marks as a special label to the disk to make contact with special labels.
In addition, upgrades between versions easier. Upgraded version of Microsoft Vista needs a special upgrade disc, as Windows 7, as long as a set of program code or image. That is, all upgrades will be pre-loaded in Windows 7 PC, waiting to upgrade product key to unlock. As for the content of a particular version, Windows 7 Starter Edition has several important features, such as the new taskbar, but there is no thumbnail preview; the implementation of a maximum of three applications, screen resolution and support for the processor will be limited. Home Basic is only in emerging markets, sales, screen size, processor, and at the same time to start unlimited number of applications and increase the network connection sharing support, and new sensors and location. However, the Home Basic or Aero interface is not such a multi-touch support, the lack of Home Premium and Professional Edition features all of the DVD player and Windows Media Center.