Problems connecting 2 computers to wireless network at the same time

Switched to Mac 2 weeks ago and will never go back!!!!!
Having a slight problem with my home wireless network.. I am running Leopard 10.5.1 and my wife has Vista... For some reason we cannot connect to our wireless network unless one of the other computers is on and connected.. Example: I just opened my Macbook and it showed that I was connected.. However, I could not get any access to the internet without first turning my wifes computer on and connecting.. The same happens when my wife tries to get online.. Her laptop will not connect unless mine is connected first.. It is rather strange.. The last one on the internet is the only one with access unless the other computer is connected.. I am not sure if this is a problem with the router or a compatibility issue with Microsoft and Apple.. If anyone could help it would be highly appreciated as it is quite frustrating that when I want to connect to our network I must connect my wifes computer first.. and vice versa for her.. Can anyone help? We use a Belkin wireless router...

For $50 or so you could get a Linksys WRT54G and not have the headaches. It cannot be an issue with the computers so by default it is the router. Get a better one.
A router will be indifferent to a computer connecting unless it is set to reject them with mac filtering, the password is wrong or there is a limit set to only issue one IP address in which case both would not work. The router cannot know XP from OSX, or a mac from Windows as the standard is 802.11 and TCP/Ip not brand specific.

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