IDLE question (0.5 repl won't start up)

[Rodney Loisel]

I replaced the 0.1 idle with 0.5 (moved the old idle to a subdir.
Now clicking on the idle.py or the idle.pyw will not  give any
response. Clicking on the old idle.pyw in the 'oldidle' directory
works okay. Tried to run idle.pyw and .py in a DOS window
and there is an error:
file "idle.pyw"  line 3
PyShell.main( )
File:  ....path... PyShell.py, Line 695
Sys.path[i] = os.path.abspath(sys.path[i])
Attribute error: abspath

Suggestions?
Rodney Loisel Enfield NH