system
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Just a comment. IMHO, deleting logs is NOT a real suggestion, but a sarcastic one only.
Whether with CCleaner or manually, whether in the registry, in simple text files or in Event Viewer, sometimes logs are useful. Moreover, not each and every line / entry in a log is telling you about an error.
You may delete logs, but I would suggest leaving at least some last period of entries in there, so if some real problem is logged, it can be identified by the repetitive appearance (as an example).