This error message is often caused when the user does not have the administrator rights of the computer or the installation is done on a network computer. To run most installations on Windows 2000, or XP machines, you are often required to be the administrator of the computer or have some kind of administrative privileges. The reason why installations require administrative privileges is because many times installations access the Windows registry and Windows System folders. If you are trying to install software on a computer in a corporate environment, you need to contact your system administrator to give you administrative privileges on your computer or install the software for you.