in many cases the following solution works. if you've tried Skpye switching off try this
few windows services need to shut down to let WAMP run(access port 80) Forum: WampServer English
for me i had to start/stop couple of service that use port 80 and it worked. details @ www.youtube.com/watch?v=bTiX4Ka25TU&feature=youtu.be Forum: WampServer English