when im trying to tether my blackberry to my macbook via bluetooth this comes up?

"bluetooth setup assistant can't set up your device as a dial up modem because bluetooth interface isnt available. open network preferences to add it"

mac os x version 10.6.4
processor 2.26 ghz interl core duo
my blackberry is curve 8900

what do i do? i need to tether it without downloading anything, or if needed it has to be free
thanks :)
 
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