Netwrok Maps - wireless problems

I have just purchased a new laptop. When connected via a wired lan the network maps correctly shows my wag160n router and the other 2 or 3 pcs connect to this. When I am connected via the wireless route, my WAG160N is not identified and I am unable to see or access the other connected PCs.

The laptop runs Windows 7 64 bit home premium, the other PCs a mixture of Vista 32 and 64 bit. My daughter Vista 32 bit latptop is accessible both wirelessly or wired.

any ideas? thanks andy

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