|start > control panel > internet options > connections tab > lan settings and put a check in the box to search automatically for connections > apply and exit then try to go online.|
If that fails then
try to see if you If you can connect to the internet without use of the router then you need to unpower the router and modem ...wait a few minutes then repower the modem and then the modem in that order..then plug the computer in to the proper lan port.
Once connected and still no internet then you need to open the command prompt by:
start > run and type in the box
press enter and in the new black window at the cursor type
a note will state that the ip address was released
this may take a bit of time but if the connection comes up then you should be able to go online.
Change Is Good