Why won't my laptop work with my wifi?

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It was working fine yesterday, and now, although it will pick up my router's signal, the internet itself will not work. It says the network is unidentified. Wired connections will still work though. I have found a few fixes for such problems but none have worked for me, and troubleshooting it will temporarily restore it.
I have already tried turning off the router and turning it back on, that did nothing.
I've also tried system restore several times. It keeps giving me an error; it says it failed while copying the registry from the restore point.
I should also say that the wifi works fine with everything else I have that can connect to it, based of what I've read I thingk it may be the wireless network adapter, though I'm not sure I know enough about that to be sure.