Apache端口8012正在使用，但仍有错误消息端口80正在使用？

由于出现以下错误，我将端口更改为侦听8012：

[Apache]    Problem detected!
[Apache]    Port 80 in use by "Unable to open process" with PID 4!
[Apache]    Apache WILL NOT start without the configured ports free!
[Apache]    You need to uninstall/disable/reconfigure the blocking application
[Apache]    or reconfigure Apache and the Control Panel to listen on a different port

单击开始时，我只收到以下消息：

Attempting to start Apache service...

这将永远保持不变，但当触摸“重新启动”时，我得到前面提到的错误…我重新启动了Xampp，但仍然是相同的错误