Wirelles problems

Hello. I ve got dual boot vista x64 and win 7 x64 on my computer. I have DWL DLINK 510 wirelles card and on other side at my friend router TP link.
It connects fine but when i try to surf the net it just dosnt work. In event viewer i get this msg :
Your computer was not assigned an address from the network (by the DHCP Server) for the Network Card with network address 0x001E58A0FAAC. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server.

So far i have tried almost everything i googled about this and the net just dosnt work....
In vista it works just fine, but i cant get it to work in windows 7....
Any ideas how to resolve this problem?

Thanks in advance guys!

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