Message 100734 - Python tracker

I downloaded Python 3.1 yesterday. I can open the Python command line, but when i press IDLE(Python GUI)shortcut no window or program opens.

i typed to command promt C:\Python31\lib\idlelib\idle.py and got an error message. It's too long to write to here, but in the end of it, it said that "This probably means that Tcl wasn't installed properly". What should I do?