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I don't know exactly what kind of dns error you mean but if you want to clear your dns cache so the client will send the dns query fresh and not assume it knows where the fqdn is, go to run, type "cmd", then type "ipconfig /flushdns"
Now try to revisit a website that you couldn't before. If it works you got some problem with dns obviously, like you don't have the preferred dns server addresses of your isp, that could be set in your router (if it's acting as a dhcp server, ie, the thing that gives you your ip address and dns address amongst other things) or it could be coming directly from the isp depending on how its set up in your case. You could also try resetting your router (either by using your browser to access the routers config settings and do a factory reset((you access your router by typing your default gateway address into a browser address bar, find your gateway address by typing "ipconfig" in cmd)) or you can stick a pin in the little round hole that should be somewhere on the outside of the router, this resets it) only reset it if you know your username and password for your isp because you will need to put that in the router again or you won't get back on the net until you do.
You could have some software interfering with your dns settings such as proxy server or malware, do a spyware scan and disable anything that might be connecting through a proxy server.
Oh yeah, first I'd try and do what was previously suggested and just repair your connection, might fix it, but if this happens all the time in different network sessions then you might want to go through what I suggested above. (contact your isp if you suspect there is a problem with their dns)
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