You shouldn’t need to uninstall it but if you’ve started then in the wdisplay program file there is a file called “Unwise” this the uninstall program and clears most of the files and registry items. Anything left in the program file can be removed with the delete button.
Here’s the FAQ for it: Uninstalling WeatherDisplay... If you must ;)
Also have a look through this FAQ for setting up a basic USB webcam: Basic USB Web Cam Setup
I’ll be home in an hour or so if you need any further assistance. 