This is a bit weird. On my lan network my friend connected his Vista laptop. At start he was getting error for the connectivity. So verified the settings and found that there is a 0.0.0.0 in the default gateway. I added the settings manually and things went back to normal. It started working. I am bit suspicious that from where does this system got 0.0.0.0 ip address. There is no device on the lan that this ip. It is fine if this the some kind of default settings, but if not then this will be a complicated problem.
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