question about using limewire on windows vista. .having problem
 

i jus got my computer yesterday and i tried to download the program and everything went fine. .and then my problem happened First one is wut is a sub directory?!. .Second is i can get the program started and then wen or while i am downloading music or even listening to it. .the computer goes to a blue screen and says windows is shutting down to protective ur computer from damage. .i dont know wut is going wrong with it if it could be my firewall or not ive call my computer company and they dont know wuts wrong either

Please help