Desktop unable to connect to the internet?

My desktop is Window 8 and connect to the internet via wireless that's built into the computer and I use AT&T's DSL internet service. My modem is working perfectly fine and I'm able to connect to the internet on my iPad and iPhone, but for some reason my desktop can't. It will either say there's 'limited connection' or 'no internet access' when my modem is still turned on. I tried restarting the modem but it didn't help. I tried restoring my desktop back to a previous time and that didn't work either.

Desktops should really be connected to Ethernet lines. But if you restored it back to a previous date when it was working fine and its still not working then you might have a little bug in your computer. Might want to scan it to make sure

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