Downloading Centra Client will definitely not harm your computer. It is not an application integral to the Operating System, and hence, its functioning is by no means compulsory. In order to uninstall it, you should first make sure that you have logged off the Centra Server and that you have shut down all the other programs that might be running on your computer. Afterward, go to the "Control Panel" in the "Start" Menu. Then, select "Add/Remove Programs," and choose "Centra Client" from the list of applications available for uninstall. That should complete the process.