1) Make sure devkitarm is in your path
2) Change these lines in insert to be windows paths.
PATH = '\opt\devkitpro\devkitARM\bin'
PREFIX = 'arm-none-eabi-'
OBJCOPY = os.path.join(PATH, PREFIX + 'objcopy')
OBJDUMP = os.path.join(PATH, PREFIX + 'objdump')
NM = os.path.join(PATH, PREFIX + 'nm')
AS = os.path.join(PATH, PREFIX + 'as')
CC = os.path.join(PATH, PREFIX + 'gcc')
CXX = os.path.join(PATH, PREFIX + 'g++')
If you're still having troubles, feel free to head to
http://www.pokecommunity.com/showthread.php?t=339708