Did you also try the "To uninstall IIS using Add or Remove a Windows Component in Control Panel"
That may be better.
Question: When you say wamp is not running, do you mean that the wamp manager icon is not in the system tray, or that Apache is still not running.
Once you get IIS uninstalled properly, I think you will also have to check your c:\windows\systems32\drivers\etc\hos
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