You still have the IIS7 Webserver installed, This needs to be uninstalled before installing any other type or WAMP/LAMP Server on your computer
Steps:
Uninstall WAMP - Restart Computer
Goto Control Panel > Uninstall a Program > Turn Windows Features on or Off
Ensure the Tickbox on the following options are NOT selected
+ Internet Information Services (All Sub Categorys Aswell)
+ Internet Information Services Hostable Web Core
Once you have unselected these options select "Ok"
Your Windows will go through some configuration settings and so forth, once this has completed, Restart again a final Time,
Once you have restarted your computer Reinstall Wamp, Ensure Ports 3306, 80, 443, 21 Are unblocked on your firewall, Unless you are using this as a Local Development Server i suggest you keep these Firewall Ports Blocked to stop outside intrusions, You will be able to access Wamp via
http://localhost or
http://127.0.0.1 With the ports still block
Happy Coding and Developing!!
Chris