my friend you have to do one thing so

1 st go to command prompt and type cd C:\Python25\Doc to navigate there
2 exit the python idle
3 hit space once (in the command prompt window)
4 so Then type hh -decompile . Python25.chm and hit ENTER
5 so only if you type it correctly you will find in the "Doc" directory the decompiled html files.
6 if you have decompiled them just re-open IDLE...