If your internet icon displays a red cross through it even when connected. Try this to fix the problem.
edit:You need to be on an admin account
Right click on the network icon and click “Open Network and Sharing Center”
You should now see this image:
Click on “Change adapter settings”
You should now see:
If there are any more connections other than Local Area Connection (except wireless connections although they shouldn’t appear unless wireless is connected) delete them.
Then right click on the local area connection and click “properties” (requires elevated privileges).
Click “configure”
On the driver tab click update driver. Then click automatically search the internet.
Windows update will look for newer drivers.
If all goes well a later driver has been released and after updating (and possibly restarting) the problem will be fixed.
If you have any queries or think something needs clarifying please post a comment.