This brief video explains, how we can configure apache server in our system, when IIS was already installed in the system. Usually, IIS is installed for ASP.NET. So if you install wampserver (and apache) after IIS, the apache won't be able to access port 80 as it is in use of IIS. This video will brief how we can change port in apache, and what other checks we need to perform to trouble the wampserver.