Added option to turn on/off script using windows backgrounds.
By default, the script is set to NOT use windows backgrounds. To toggle on, once run, edit the "Settings.cfg" found in the same folder as the script, and change the "UseWindowsBackgroungs" value to "True" (no quotes).
If you later decide to not use windows backgrounds, change the value back to "False". Unfortunately, you will have to manually remove any windows backgrounds from the Backgrounds folder before it stops using any already downloaded images. Once you remove them from the Backgrounds folder, it will stop downloading any more in the future.