dev tools not loading


Maybe i'm being a complete idiot, but I have all the dev tools installed on a different partition than OS X, and every time I try to open one of them up (by double clicking in the finder), the program looks like it is loading for about a second, the icons appears for a second in the dock, then it goes away and the program doesn't load. What am I doing wrong? (If you can't tell, I am pretty much a newbie, just wanted to play around with the dev tools during some spare time)