Even I faced the same issue initially and I reinstalled wamp , thinking I might messed up with something. Though the problem was not with Wamp, but with other other application which is blocking port 80. In my case it was Skype. For people using Skype Wamp will not work for them. Here is little trick which you can use to configure Skype and your Wamp will start working.
Open Skype and navigate to Tools> Connection options > Advanced > Connection
Uncheck the option which says use port 80 and 443 as alternative for incoming connection.
After un-checking that option. Restart Skype and restart Wamp. Now try starting Wamp and let me know if it’s working for you or not. Though, it’s not necessary, Skype is the problem always, there might be some other software which conflicting the PORT to be used by WAMP, find the faulty program and change it’s port number.
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