Consider the following scenario:
You have a 3rd party driver installed on a system via the 3rd party installation
The driver installer also installs a 3rd party application or applications
You try to uninstall the driver through the Device Manager
In this scenario, the driver files, as well as the 3rd party application are not removed. Each time you reboot the machine, or any other action that forces a re-enumeration of plug and play devices, it will try to install the drivers.