adhoc network + os X


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i have a windows xp pc which i have set to transmit a wireless signal so i can connect my laptop to it. my windows vista laptop connects to it fine, and it also allows me to access the internet.
but when i try connecting to it using my mac power book g4, operation system: os x. it lets me connect but when i try to go on safari i get a message saying the it cant connect to the server.
is there some kind of setting that i am suppose to change or something?
does any 1 know what is wrong?
any help would be appreciated
thanks in advance