Here is a simple fix for the following errors:
Apache is not started
WARNING: terminating worker thread 0
If you tried re-installing apache and didn't work then the problem in this case is that another program is reserving port 80, either you change the port on httpd.conf or close the program, to find what program is waiting on port 80 run "netstat -a" on CMD or windows run.
Most common program to cause this problem is Skype, if you have it open just close it and enjoy :)
Hope that I helped you guys.