This usually means something else on your system is using port 80. Most likely it is Skype, if you have Skype installed, shut it down and try to restart apache.

I also discovered an interesting solution to this the other day. I will likely put a video together going over all of the ways to troubleshoot Apache Start issues.

The only way I was able to resolve it in the end was to install the Visual C++ 2008 32-Bit Redistributable Package or the Visual C++ 2008 64-Bit Redistributable Package – it worked out great. Apparently there were some missing Windows DLL files that are installed when this package is installed.