A new version of Windows Internet Explorer comes out every couple of years.The most recent stable version as of October 2010 was Internet Explorer 8 which ships with Windows 7 and is compatible with several other Windows editions. Check what version of the Web browser you have before you install add-ons. Many add-ons require a specific version of Internet Explorer to run correctly. Knowing what release you have is also important if you are a Web designer and you need to test a website on different browsers.
Click the "Start" menu button, click "All Programs" and then click "Internet Explorer." Or click the "E" icon on the taskbar.
Click the "Help" menu when Internet Explorer opens.
Click "About Internet Explorer" from the "Help" menu. A box will appear displaying the current version of the Web browser you are running. You can also see other information such as updates and the product's unique identification number.