Internet connection connected, but cannot use internet

Okay so I have a fairly good gaming computer in which i have just formatted and reinstalled windows 7 on, after having an issue of not being able to find an ethernet connector driver to be able to notice a router connected to my computer, which i have now resolved as i installed a network adapter driver and so my network sharing centre has connected but my webpages will not load, i tried something i seen online typing in a command in the CMD but after rebooting the web pages started to load once... and now it isn't working again. Though it is not just webpages it is other applications such as installing my AVG, says it cannot complete installation as there is no internet connection detected.. also i don't know if anybody is familiar with origin but i also need to log in to install some games... this is also saying it can only log in when online... so basically everything on my computer is acting like there is no internet connection except the network centre which has a connection... I have tried troubleshooting but obviously the connection is made so it doesn't see a problem. I'm not the best with computers so if someone could help me out in simple terms.. please and thank you!