direct wireless connection between two laptops problem

i connected two laptops directly wireless, but with one laptop i can do
everything with another: copy from it, copy to it..., but with other one i
just can see other laptop name, and when i try to connect on it, it says:
cann´t connect on ---computer name---- , access denied, etc.
i dont where to search for the problem, i had some firewalls :zone alarm,
windows firewall, but I turned it off.
thanks

one laptop has SP1, another SP2.