Apple Logic Pro /LogicExpress Discussion

I am running Logic 5.5.1 and I was experimenting with PC AV. Every since I clicked this in the Audio preferences, the program will not run. I get the opening screen, and you see all the modules that are loading on the bottom, but when it gets to PC AV ESE something or another, it freezes.
   
  I tried uninstalling and re-installing, but it still shows up. Is there a way to de select this option from outside the program?
   
  I am running XP Pro, with 2gb of RAM - I have M-Audio Firewaire Solo, but tried disconnecting it.
   
  Thanks in advance!
   
  Chaz


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