IDLE won't run

[Rob]

I have Python 2.4.3 installed on Windows XP on both a real computer and a 
virtual machine under VMware. Just recently, IDLE stopped working. I would 
select IDLE from the start menu or right click on a .PY file and open it in 
IDLE, but nothing happens. I just uninstalled Python on the virtual machine 
and installed 2.5 in the hope that that would fix the problem, but it 
didn't. It, too, would do nothing when I tried to run IDLE. In both cases, 
the Python command line window will come up, but that's not what I want to 
use.

Does anyone know of a way to fix this problem? Is there a new Windows 
update that is now interfering with IDLE? Would Norton Antivirus be 
interfering with it somehow? (It's running in both environments.)