Win 7 connection to Win XP problem

I have a mix bag of XP and Win 7 Home os running on my wireless network.

Since I've loaded 7 on a couple of my computers, the XP computers do not see the 7 computers and vice-verse. When all of the computers were XP they were all sharing and working well.

My wireless router is the D-Link DIR-628. When I log into the router it identifies all items connected to the network.M
I have tried loading to the network sharing using the Network and Sharing Center, but when it searches the network it tells me there is a problem and offers choices of help. Non of which, have. If it matters, the first computer in the string is an XP system.

Any help would be great.

Thanks, Tom

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