N3 Quits When I Try to Enable Kontakt 2

Mac OS X 10.5.8 on MacbookPro with 2 Gb RAM
Under VST Manager I have been able to enable 2 VSTi selections but every time I try to enable Kontakt the application unexpectedly quits. I really need my Kontakt sounds...
Suggestions?
Under VST Manager I have been able to enable 2 VSTi selections but every time I try to enable Kontakt the application unexpectedly quits. I really need my Kontakt sounds...
Suggestions?