Under intense three-month effort that he and partner finally realized write a windows virus. This virus under windows XP test environment to achieve a lookup file, delete, replace, and the basic functions of self-replication. On the most basic functions, adding the virus since the launch, U disk and the ability LAN communication. In order for the virus to be more safe operation, the transformation of the virus, the virus will be hidden process, and no interface treatment. In the test virtual machine is found, the virus can completely destroy windows XP system without anti-virus software to detect. However, in subsequent windows version, with the UAC feature was added, the results of the virus greatly discounted. After all, it is a small independent experiments, could make this work their own small or very satisfied ~