Unable install iTunes & QuickTime

[Bullwinkle]

I had a working copy of iTunes v7.0 which was to be updated by apple. In
doing that it automatically corrupted the working copy.

I then tried to remove using add/remove. However, the program no longer
showed on add/remove.

I then removed it manually including cleaning the registry (carefully). The
computer is working fine except I am unable to reinstall either the original
version or the update. I get the following message:

iTunes installer completed.
The installer encountered errors before itunes could be installed.
Your system has not been modified. To retry these operations at a later time
please run the installer again"

This is gibberish a nd tells me nothing.

I have tried to install number of times and always get this same message and
a failed install.

I have asked apple itunes support without success. Can anyone help me?

I would be thankful and most appreciative.

Regards,

 

[Touch Base]

I had a working copy of iTunes v7.0 which was to be updated by apple. In
doing that it automatically corrupted the working copy.

I then tried to remove using add/remove. However, the program no longer
showed on add/remove.

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http://support.apple.com/kb/HT1926

Scroll down to:
General installation troubleshooting
Clean up iTunes installer files on the computer
Important: A majority of customers experience successful iTunes installation
after completing these troubleshooting procedures. If one does not help,
proceed to the next.