Sometimes it happens that Windows 7 to get on the first attempt by a DHCP IP address will be delayed and then maps the 169er address. This is Stupid: Windows 7 stores under the MAC address of the router in the Registry:
HKLM \ Software \ Microsoft \ Windows \ CurrentVersion \ Internet Settings \ WPAD
And for a while Windows 7 will attempt no more of this router with the MAC address of an IP address to get. But you can delete the registry branch WPAD. After a reboot, Windows should try 7 then again from this router via DHCP to obtain an IP address.
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