Apache不会在xampp中运行。

I have just installed XAMPP and everything works fine except that I can't get apache to run. It seems that port 80 is the problem, I have disabled Skype to use port 80 but it doesn't seem to fix it. I read somewhere that the SSL port can be the problem and should be changed. But I cant figure out were the port is or how to change it.I have just installed XAMPP and everything work