There is no connection to firewall or adblocks. You can surely use one, but the behavior you described goes beyond typical web ads annoyance. Adblock: Try Ublock Origin (Download from Chrome store)
Hi Yolande This is strange. Do you have many files you need on your iMac? Did you backup?
Cameron, Thanks for writing! Apple has this to say about Gatekeeper: https://support.apple.com/en-us/HT202491 "Gatekeeper helps protect your Mac from apps that could adversely affect it. Some
Stephen, sorry I've been so long. I didn't forget you but I'm up to my eyeballs with urgent tasks that are consuming all of my time. Because it sound like your computer was hacked, I think your best
Stephen, Do you have your disks for Office 2011? While we could try to go step by step and delete Microsoft preferences, (which I'm happy to help you with should you decide to go that direction), my