Ooh, I cannot stand Microsoft. They did it to me again. This time after installing an SQL Server service pack and going into the database. Microsoft HTTPAPI/2.0 ripped port 80 away from Wamp. Again I'm pulling my hair out trying to figure out why this happened. All the prior usual suspects were locked up: IIS, Web Deployment, Skype, etc.
Turned out this time it was SQL Server Reporting Services. Thankfully I came across Griffin.blog to find this out.