Internal compiler error

after installing unity 4.5.2 , i keep getting this error Internal compiler error. See the console log for more information. output was:. I seen the answer to other question but i don’t understand them. i can’t find the log file and before unity open,i get this nofication that mono.exe is not responding. i would like to get the simplest answer to how i can remove this error, by the way, this error happen no matter which project i go on and initially is there.

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