Q: Can only connect to HTTPS sites

I can only connect to HTTPS sites. I have tried in both my Safari browser and my Chrome browser. This is happening on all my devices: MAC (OSX 10.9.5), iPhone (when in wireless mode) and iPad. Same issue on my windows laptop that I brought home from work. We also cannot connect to Netflix, Amazon Prime, etc, on our Roku.

I have tried resetting my cable modem and my wireless router. I also tried a fix that I found in the forum here that was posted in June. It involved removing suspect files from the Launch Daemons (sp?) folder. That did not fix the problem.

What else can I try?