TheMD ...
Is it possible that you have either Sky Player Online/Channel Four OD, or Veoh installed? If so the service KService (the Delivery Manager) could be the culprit, as it does something with Port 80, even if it doesn't actually claim it 100%.
If this applies to you, open up Services, find KService (Delivery Manager) and using the Properties Dialogue, first stop it, then switch it to
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