I have tried everything to get ccleaner from opening up, after I play World of Warcraft. It has become beyond annoying
in ccleaner's "options," try adjusting the settings, there.
if ccleaner is opening automatically, you must have some automatic cleaning enabled.
As said that's most probably the 'Smart Cleaning' option that is cleaning up temporary files after you have finished playing.
The quickest way to stop that happening is to turn Smart Cleaning off.
(Or you could set it to let more junk accumulate before Cleaning, or go more advanced and make the Warcraft files 'excludes').