I simply installed the apache 2.2 http server and that i understand this error message whenever I hit start:

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How do you solve this?

Kill whatever is certain to port 80 (may be IIS for instance)

you may have IIS running. also it runs like a service and begins every time you start home windows. open Run type this and press ENTER key: services.msc

the help console will open. now search for IIS(internet information services) service and open its qualities and alter its start-up mode to Manual in the dropdownbox. plus steer clear of the plan to free the main harbour number 80 for Apache to make use of.

have a look only at that link: Starting and Stopping IIS

I really hope this can help.