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I started Idle from a command prompt:
 C:\Python30>python Lib\idlelib\idle.py
And followed the instructions. After the step f/ I got the error 
message:
Exception in Tkinter callback
Traceback (most recent call last):
 File "C:\Python30\Lib\tkinter\__init__.py", line 1405, in __call__
 return self.func(*args)
 File "C:\Python30\Lib\tkinter\__init__.py", line 493, in callit
 func(*args)
 File "C:\Python30\lib\idlelib\ColorDelegator.py", line 152, in 
recolorize
 self.recolorize_main()
 File "C:\Python30\lib\idlelib\ColorDelegator.py", line 185, in 
recolorize_main
 next = self.index(mark + "+%d lines linestart" %
 File "C:\Python30\Lib\idlelib\Delegator.py", line 10, in __getattr__
 attr = getattr(self.delegate, name) # May raise AttributeError
AttributeError: 'NoneType' object has no attribute 'index'
Exception in Tkinter callback
Traceback (most recent call last):
 File "C:\Python30\Lib\tkinter\__init__.py", line 1405, in __call__
 return self.func(*args)
 File "C:\Python30\lib\idlelib\MultiCall.py", line 165, in handler
 r = l[i](event)
 File "C:\Python30\lib\idlelib\IOBinding.py", line 222, in open
 self.editwin.flist.open(filename)
 File "C:\Python30\lib\idlelib\FileList.py", line 36, in open
 edit = self.EditorWindow(self, filename, key)
 File "C:\Python30\Lib\idlelib\PyShell.py", line 114, in __init__
 if self.io.filename: self.restore_file_breaks()
 File "C:\Python30\Lib\idlelib\PyShell.py", line 222, in 
restore_file_breaks
 filename = self.io.filename
AttributeError: 'NoneType' object has no attribute 'filename'