There are many different Web browsers currently available and many different versions coming out constantly for each of them. It can be important to figure out which browser you're using and which version you have for the purpose of doing troubleshooting or determining the capabilities of your current browser, including what kind of plug-ins you can install. You can figure out which browser you're using by looking in the menus of the program.
Click "Start" in Windows and look at where it says "Internet" in bold letters in the top left corner. The name under the label shows your current default browser. For Windows, this will be Internet Explorer unless you've changed it.
Click the "Help" option in Internet Explorer.
Select "About Internet Explorer" in the drop-down that appears. This tells you which version of the browser you have. Most browsers have a Help menu that has an About option where you can get information about the browser and its version.