Hi!  I just upgraded to Python 2.6.2 (from 2.5) on Windows AMD64 in order to use Numpy 1.3 for AMD64 and got the following error:
 
- pythonw.exe has stopped working
 
Numpy was installed both per-machine and per-user but the error persists.  Python 2.6.2 works without Numpy. 
 
Any ideas?
 
Dinesh