Adjust the settings of the wired net card (automatic IP) - Windows 7

1) In the lower right corner of your computer screen, right click the computer icon and click "Network and sharing center":
network and sharing center

2) Click "Change adapter settings" on the left side of Network and Sharing Center:
change adapter settings

3) Right click "Local Area Connection" and choose "Properties":
Local area

4) Click "Internet Protocol Version 4" and Properties:
Internet protocol

5) Make sure "Obtain an IP address automatically" and "Obtain DNS server address automatically" are selected:
Automatically IP

6) Click OK and OK again, now the net card should be ready for receiving an IP address from UoI.