nightingalero, sounds like you may have one or more of the common types of ad-injection malware on your computer Leperdvil definitely fits in the malware category. Use a good anti malware software to eliminate it. Check on here for [https://support.apple.com/en-us/HT203987|more instructions] If the malware block access to a page on your computer, start in safe mode by holding down the shift key at the startup chime, then try again.