You need to include details or we can't help you. There are dozens and dozens of useful details. You didn't include any of them xP
Here a just a few examples:
Details that establish that your problem isn't upstream:
Other devices on the same network have internet access.
Using the same Ethernet cable etc. on another computer works.
Etc. Etc.
Hardware specs. Is it a laptop or desktop. What mobo? How is it connected to the internet? Etc.
Software/OS Details. Window? Linux? Mac? What version, build, servicepack, etc.
Screenshots or other translation of all the technical goop. For instance what does it look like in device manager, various networking dialogs, etc. etc. ("the ones for the internet" is not specific enough)