chill

HI, I am new here and apologise if I am posting in the wrong section ? anyway i have just run the ccleaner analasis and it has come back with suggested files for deletion but I am unsure whether it is safe to delete 'system' windows log files.. that it has identified? it says there are 368 files 154,747 KB... Can anyone please advise me as i would hate to mess up my operating system but on the other hand i think my computer needs a good clean up and I am not sure what to do many thanks Chill