I accidentally clicked on something (don't recall what) via Safari that i should not have and now that web browser is seriously infected with some sort of malware with the following symptoms: - Clicking on an email to open it, or on hyperlinks within an email, or within web articles opens new, unrelated windows and tabs for adverts and other sites. - Text in my own private website, as well as articles on the web, is now highlighted with double-underlined words (usually green) that create entirely new windows/adverts simply by rolling over them with my cursor. - Writing emails is near impossible--constant spinning rainbow wheel, typing and scrolling stutters and gets 'stuck'. - Netflix movies stutter and freeze (not a Netflix issue, but a Safari/malware one). Someone please help. This is making my life hell. Thanks!