Limited or no connectivity even after reformat

I had to reformat my PC about 3 days ago, and before I reformatted I got the limited or no connectivity signal. I fixed it on two computers; but dont know what I did to fix it. Well I formatted mine do to some virus. But now the limited or no connectivity error is back. It will allow me to look at files on the host computer on my network, and even the computer in the garage, but it wont let my computer on the internet. Could someone please tell me what I need to do to get rid of this?

 

Can you please give us some more information about your set up? Is this wired or wireless?

Can you also confirm that you can access other computers on your local network from the problem PC, but not the internet?