Avast Security
During the time that the Apple Stores here in NYC were all closed, I had to have my MacBook Pro repaired. The repair is fine, but the repair person installed the free version of Avast Security on my MacBook. Since that time, nearly every website I visit, even if I have visited it thousands of times, results in a your connection is not private" error message and doesn't allow me to sign on to the website. This is making it very difficult for me to accomplish my daily work and pleasure activities. Is this a common Avast problem, and should I just uninstall it (if so, how?). Appreciate any help anyone can provide.
MacBook Pro 13″, OS X 10.11