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Possibly downloaded a virus to my new iMac

I was on my new Mac this morning and went to download an xls spreadsheet to view in numbers. Upon downloading an adobe flash player update popped up. I assumed it was plausible given this is a new computer and may not have the most up to date flash player. All of the downloads and run windows all looked very familiar and legit. When I was done installing my computer made a loud beeping sound and said it has been infected by a virus. It opened a new window called Mac Repair and said I had 197 viruses on my computer that needed repair. It prompted me to hit the repair button in the window but I was highly skeptical at this point.

I went back into my downloads and found the recent adobe file I downloaded. I googled it - adobe flash player-2.dmg. It immediately popped up on blogs as a phishing virus. So I removed it to the trash can then emptied my trash can. I’m sure this is not the proper way to rid of this. Can please call or email to discuss further to clean my computer. Also, all of these virus related things keep coming from being on either Yahoo main page or news. Or thru my email on yahoo. I’ve never had these issues in the past until the recent 6 months or so. Is this common with Yahoo as of late?
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This is a very common occurrence unfortunately. Malware often disquises itself as flash, java, "security updates" or other words we are used to seeing. The good news is that just downloading a file doesn't hurt you. Double clicking on that file doesn't hurt you. But once it prompts you to install it, it HAS to ask for your computer's password. Entering your password is then what grants permission to your computer to install the malware. Most of the crapware is simply there to take over the ad space within webpages. They're usually not after personal information. They are just trying to sell ads in places on pages where google already does. If you feel like you may have entered your password and would like me to clean things off the computer, I can do that remotely for you. You/wife can schedule an online session.

What you saw with the loud sound and warning that you were "infected" was just an ad. The next time you land on one of those pages, close Safari, hold down the shift key and restart Safari. That will take you away from that ad site regardless of what background code was running on the page that wouldn't have let you move on to another page.
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