I am a programming (and Python) novice. I am unable to run any python script in command prompt of my WinXP 64-bit laptop. I assigned the path and confirmed it by typing set
You are typing the command inside the Python shell, do it from the DOS prompt.
I.e.,
C:\somepath\> python hello.py
since you already have the python executable on the path (the number 1 problem usually when things don't work), you should be set to go.