windows 7+windows xp=problems

i have 2 computer "mainframe" is Windows 7 home premium 64bit,and kid computer is Windows xp sp3.
i have also d-link dir-600router,it is just installed and working very fine.Router hardware version is:B1 and firmware version is:2.01
My modem is WebStar/ScientificAtlanta.
But problem is when win xp pc goes to internet,i cant connect to internet.only message there is no web site(like example When i use my router/modem?Or is it something else???

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