Why only (secure) https sites are working on my MBP?

For the past 2 weeks, I had this problem where only work on all browsers (Safari, Chrome and Firefox) https sites. When I try to visit a site of 'http', I get a message "unable to connect to the server. I remember not to meddle with anything on my computer. I noticed that if I use the guest account only Safari, I am able to navigate properly. Does anyone else have this problem? Please help me out here - it drives me crazy.

You have an antivirus installed? They can be 'help' you.

Tags: Notebooks

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