Why won't my laptop open web pages?

My Lenovo G510 which was refurbished by the company and bought by myself is only about 6 months old. This Sunday I was using the internet but it started getting spotty at around 5. It then got worse and worse until I lost the ability to surf the internet entirely. However strangely my fantasy football fantasy cast (which was already open before everything stopped) continued updating the scores. I also noticed today (it still won't open web pages) that my stocks up shows updated stocks, just as my sports app shoes updated headlines. Does anyone know what the problem may be? I've tried it on different Wi-Fi networks and the problems have been the same.