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Help questions should better be directed to comp.lang.python == 
python mailing list == gmane.comp.python.general.  The answers 
you get should help determine whether there is a bug in the 
install file distributed by PSF that should be reported here.  

Given that the install appeared to go ok until it tried to remove the 
existing files, I wonder whether there is a process running in the 
background that is using the existing install.  That issue has been 
discussed on the python group recently.