When I re-run the Python 2.5 final installer and 
choose either Repair or Change options, it makes it to 
the "Publish product information" step then says:

"A network error occurred while attempting to read 
from the file:

C:\Documents and Settings\username\Desktop\python-2.5
[1].msi"

The thing is, I saved the file as python-2.5.msi and 
the file it mentions does not exist. If I copy python-
2.5.msi to python-2.5[1].msi, then run python-2.5.msi, 
the installation works!