First off, welcome to BC !
Second off - relax, stop panicking, you are among friends !
Third - your problem. First thing to do - click on the little wi-fi symbol at the right hand end of your taskbar and see if it shows the name ( the SSID ) of your router and states 'Connected'. If it doesn't, then there is a connection problem between the computer and the router, but from what you have said this isn't the case - but it helps to check.
Next, RIGHT click on the little wi-fi symbol and select 'Open network and sharing centre'. This brings up quite a large dialogue box. At the top of it is 'map' of your network connection with your computer on the left, a house - representing your router - in the middle, and the wide, wide web on the right. These places are joined by lines. If there is a red 'X' on the line between your router and the internet there is a faulty ADSL connection. Check that the wire connecting the router to a phone socket is correctly plugged at both ends. Then switch the router off, wait 30 seconds or so, then switch it back on and see if you are connected, ie, web pages display.
If they do, super. If they don't, and you still have a red 'X' on your network map, then it is time to check that you have all the necessary filters in place and that all your phone lines are properly connected as far back as the socket where they come into the house. If this check shows up any sloppy connections or other errors, fix them then have another look at your computer. If you still have the red 'X', it is now time to phone your ISP and dump the problem in their lap.
Nor ALL internet connection problems are due to faults and errors inside your control ! If for example, your local phone company is digging up the road outside your house, you can only hope they leave you connected. A couple of months ago my wife watched a BT engineer climb the pole outside our house to carry out some repair or other. In doing so, he broke our connection. Three days later we got the phone and internet back !