Holding down the SHIFT key while restarting the computer restarts the Mac in safe mode. When you try to open safari, the computer asks you if you want to restart the previous web sessions! Do not open the previous sessions! I did this and it worked like a charm!
Said it was Mac support. Came with a long 'System Security At Risk' warning on my screen. I searched the internet on my phone to see if it was legit now the screen with the warning is showing on my phone and I can't get rid of it. It's a Hawaii number.
If you get a pop up telling you that you have a trojan horse virus and you need to call 808-518-4618 . THIS IS A SCAM ! They wanted $300 and your CC info so they can fix the virus. I called apple support and they fixed the problem and told me that it was a scam and to report it. This is a crime and it would give me pleasure to see them go to jail. I reported this scam to the proper authority you should too.