最近出现了两次apache停止工作的现象，请问是什么原因

[wqq577w]

使用的是阿里云的虚拟服务器！错误详细如下：
问题签名:
问题事件名称: APPCRASH
应用程序名: httpd.exe
应用程序版本: 2.2.16.0
应用程序时间戳: 4c5340fc
故障模块名称: php5ts.dll
故障模块版本: 5.2.17.17
故障模块时间戳: 4d25fb49
异常代码: c0000005
异常偏移: 0000ad66
OS 版本: 6.1.7601.2.1.0.272.7
区域设置 ID: 2052
其他信息 1: 0a9e
其他信息 2: 0a9e372d3b4ad19135b953a78882e789
其他信息 3: 0a9e
其他信息 4: 0a9e372d3b4ad19135b953a78882e789
2015-07-24 08:37:34

下面是httpd-error.log里面的部分信息
[Fri Jul 24 08:30:17 2015] [warn] (OS 64)指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Fri Jul 24 08:30:17 2015] [warn] (OS 64)指定的网络名不再可用。 : winnt_accept: Asynchronous AcceptEx failed.
[Fri Jul 24 08:30:17 2015] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Fri Jul 24 08:30:23 2015] [notice] Apache/2.2.16 (Win32) PHP/5.2.17 configured -- resuming normal operations
[Fri Jul 24 08:30:23 2015] [notice] Server built: Jul 30 2010 16:15:37
[Fri Jul 24 08:30:23 2015] [notice] Parent: Created child process 3348
[Fri Jul 24 08:30:24 2015] [notice] Child 3348: Child process is running
[Fri Jul 24 08:30:24 2015] [notice] Child 3348: Acquired the start mutex.
[Fri Jul 24 08:30:24 2015] [notice] Child 3348: Starting 64 worker threads.
[Fri Jul 24 08:30:24 2015] [notice] Child 3348: Starting thread to listen on port 80.
[Fri Jul 24 08:30:50 2015] [error] [client 113.138.77.71] File does not exist: