So it sounds like you were being blocked from accessing sites by either Child Safe or Web Safe. Odd that you got "This site can't be reached" instead of a VM page explaining that the site was being blocked and which service was blocking it. Had that happened either myself or @Kippies would have been able to help you much sooner, but not your fault.
I'd strongly recommend turning Web Safe back on as it will protect you from all sort of Internet nasties and sites blocked by that service are usually blocked for a very good reason. I have it turned on even though I also have the premium version of Malwarebytes providing real time protection on my PC. I prefer a belt and braces approach when it comes to online safety.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.