Kumar, I would like more information here.
How are you connecting to the internet, is it via BSNL's router or how ?
Its better if you can detail me what broadband provider you use and what is the make of the router being used. Also how does this router connect to your machine.. is it via RJ45 cable or USB cable ?
Just FYI... Since this was not happening in earlier release than RTM then I will file a bug for it and see if I can get this resolved, but one thing is that you need to have a legitimate copy of Win7 or any support incident account... you said you have MSDN account that should be fine.