Hello i got the problem since my new pc. 
  
Dualcore 2,67ghz 4mb cache intel 
  
8gb ram ddr2 800 cl5 
  
8600gts nvidia 
  
asus p5b 
  
sata hdd  
  
vista 64 bit  
  
PB update already done pb folder erased new downloaded / overheating already checked  
  
firewalls disabled for testing if blocked no thats not the problem 
  
so everytime when i join a PB server (perseus or combat) my pc froze complete so i had to restart the system. 
  
this happens after ca. 5 sometimes after ca. 10min  
  
Reinstalling of game wont work too. 
  
Playing on none pb server works without problems  
  
btw crysis with pb works fine if this information helps 
  
so hopefully some1 got a answer 
  
thx 
  
columbus