Tracking application

I need similar application like freelancer hourly tracking application, with some changes. 1) Once it install, it should not be uninstall from program manager, it can only be uninstall by installer application only. Means it will work in hidden mode. It should auto start with system system, and stop when system stopped. 2) We need screenshot every 5 mins, with count of mouse click and keyboard key press. Please provide me your final estimated budget for desktop application, it should work in windows, mac, linux, ubuntu. Api already ready by one developer.