Violet Intermenos

i have just downloaded the viewer 2 from the website cos i normally use the very old one , but im trying out the new one ,i have a ACER Aspire 5750 4gb Core i3 - Black...LaPtop... but when i am logging in with this new viewer it says "log in failed, DNS cannot resolve the host name...??? what does this mean?! help me!!

does anyone know or have anything about an ACER Aspire 5750 4gb Core i3 - Black...LaPtop... i am looking into getting it but in the shop wifi was a poor connection and although the internet was fine second life made me a cloud or egg in the viewers...my av just wasnt loading ...sooo anyone know anything that can help me? ty :