I have run into issues with many different HP computers lately trying to uninstall their HP Client Security. It is by itself a pain to uninstall as generally four other applications must be uninstalled first. It will list the applications that must first be uninstalled when you try to uninstall HP Client Security.
The main issue though is that HP Client Security has a flaw where it won’t uninstall. This seems to have something to do with the DVD drive.
The ideal solution would be for HP to fix their software. In the meantime if you wish to uninstall HP Client Security just go to Control Panel –> Device Manager and disable your DVD drive. Perform the uninstall, having to uninstall the other features first. Then, enable your DVD drive again from the Device Manager.