please checks as below step by step.
1. If Wire connection please set manual IP in your computer as same series. And then see what happen.
2. If wireless then please right button click on wireless icon then you will see Open Network and Sharing Center. Click here then you will see full map of you internet connectivity and there is a Cross sign about your computer name and the router name. Now please click the cross then your computer will find your problem and fix it automatically.
If problem not solve to use this trick then please call your internet service provider to resolve your issue.