How to remove IIS 7 on Windows 7
Solution 1:
In the Control Panel, go to Programs and Features, then click the "Turn Windows Features on or off" on the left menu pane. Then uncheck the IIS entries. (under "Internet Information Services")
Does that do it for you?
Solution 2:
If you want a quicker way, Win + R to open a run box type optionalfeatures in the box and press enter, uncheck the IIS entries, click OK then reboot.