Wamp cannot be started normally

The day before yesterday can be started normally, but it will not work today. The apache Error Log reports the following error: Please be grateful for your answers. {code ...} the day before yesterday can be started normally, but it won't work today. The apache Error Log reports the following error: Please be grateful for your answers.

[Mon Aug 10 13:30:39.002985 2015] [mpm_winnt:notice] [pid 11968:tid 392] AH00455: Apache/2.4.9 (Win64) PHP/5.5.12 configured -- resuming normal operations[Mon Aug 10 13:30:39.002985 2015] [mpm_winnt:notice] [pid 11968:tid 392] AH00456: Apache Lounge VC11 Server built: Mar 16 2014 12:42:59[Mon Aug 10 13:30:39.002985 2015] [core:notice] [pid 11968:tid 392] AH00094: Command line: 'D:\\wamp\\bin\\apache\\apache2.4.9\\bin\\httpd.exe -d D:/wamp/bin/apache/apache2.4.9'[Mon Aug 10 13:30:39.012985 2015] [mpm_winnt:notice] [pid 11968:tid 392] AH00418: Parent: Created child process 12076[Mon Aug 10 13:30:39.453010 2015] [mpm_winnt:crit] [pid 11968:tid 392] AH00419: master_main: create child process failed. Exiting.

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The day before yesterday can be started normally, but it won't work today. The apache Error Log reports the following error: Please be grateful for your answers.

[Mon Aug 10 13:30:39.002985 2015] [mpm_winnt:notice] [pid 11968:tid 392] AH00455: Apache/2.4.9 (Win64) PHP/5.5.12 configured -- resuming normal operations[Mon Aug 10 13:30:39.002985 2015] [mpm_winnt:notice] [pid 11968:tid 392] AH00456: Apache Lounge VC11 Server built: Mar 16 2014 12:42:59[Mon Aug 10 13:30:39.002985 2015] [core:notice] [pid 11968:tid 392] AH00094: Command line: 'D:\\wamp\\bin\\apache\\apache2.4.9\\bin\\httpd.exe -d D:/wamp/bin/apache/apache2.4.9'[Mon Aug 10 13:30:39.012985 2015] [mpm_winnt:notice] [pid 11968:tid 392] AH00418: Parent: Created child process 12076[Mon Aug 10 13:30:39.453010 2015] [mpm_winnt:crit] [pid 11968:tid 392] AH00419: master_main: create child process failed. Exiting.

Created child process 12076
Create child process failed. Exiting.
Failed to create the sub-process. Check if the port is occupied. wamp has been used before. Sometimes port 80 is occupied when the sub-process fails to be started.

netstat -aon | find ":80"Check whether port 80 is occupied.tasklist /fi "PID eq 123"123 pid for netstat listen