Wi-Fi signal drops from 100% to 32% as soon as I connect

I just bought a new laptop with Windows Vista and having an issue that I
cannot resolve myself. When I open the list of wireless networks it shows
that the signal strength from my router is 100% (it is located just a few
feet away), however as soon as I connect to the router the signal drops to 32%
.. When I disconnect it immediately displays 100% again.

I have three more other laptops with WinXP and non-of them has this issue.
Also when I connect to a neighbour wireless network it Vista displays 100%
signal strength all the time.

Does anybody know what could be wrong?

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