Ok, let see if you installed IIS properly.
Go to 'Add/Remove Programs' and click on 'Add/Remove Windows Components' (on the side).
Click on Internet Information Services (it should be ticked) to highlight it > Click on 'Details' button
Click on 'World Wide Web Service' (it should be ticked) to highlight it > Click on 'Details' button
The 'World Wide Web Service' option should be ticked, like in the screenshot.
Don't worry if other extra options are ticked.
Let me know if you see this: