I can still use Limewire Pro with my old computer, Powerbook G4 15''. But on my new iMac, I get the brick wall wich says Limewire detects a firewall, but when I check my system requirements, it says the computer's firewall is turned off.
Hardware:
Model Name: iMac
Model Identifier: iMac9,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.66 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 2 GB
Bus Speed: 1.07 GHz
Boot ROM Version: IM91.008D.B08
SMC Version (system): 1.44f0
Serial Number (system): YM9261350TF
Hardware UUID: E9C282FD-1C6A-5A46-8EF7-D0DB299B4CE7

I can't find where it mentions how many bits I am using.