Do you remember what the configuration exception said? You can run
Check Apache Config from the start menu group Repos Server. If nothing
starts, it might be because you're missing the Microsoft C++ runtime.
There's a download link at http://reposserver.com/#p-download. You
might need to reinstall after you have the runtime installed.
I don't like the dependency to that microsoft package. We'll try to
get rid of it for the next release.
When the installer works, Apache is installed as a service.
/Staffan