How to prevent this script run in server?

hi everyone

i have a hard time to prevent evil php script run in my server. When i try to run it in my server, then my server load will be raised really fast from .4 to 10 in around 15 minutes. I just worry if someday my clients will run this kind of scripts when i am not online, then my server will be crashed in hours, and does anyone know how to prevent this script run in server ?thanks for reading

p/s: my server linux FC+ cpanel. Apache 1.3.33,php 4.x.10 (just updated apache)

 

 

 

 

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