As mentioned by "Xps86", location of the icon will determine the number of clicks required to open the application.
If double clicking the application is not opening it, you may try reducing the double click speed. To do that, perform the steps mentioned below:
1. Click Start> Control Panel> Mouse
2. Reduce the Double Click using the slider
3. Apply the settings and click ok
If you are referring to the web browser not opening, reset the browser. For Internet Explorer, refer to the link mentioned below:
Thanks & Regards