multiple php.exe in win server. HELP
 

I'm running Window adv server with 2.4GHz. Is it normal to have multiple "php.exe" that pop up and leave in the task manager? is there a way to make only one php.exe to run in the background? Since i'm running Live Chat script on this server only. But when having more than 25 visitors that came to the page at the same time. there are about more than 15 "php.exe" in task manager which took 100% CPU usage and slow down the server.
Is there a way to fix this problem.

Thank you