I am unable to re-install iTunes after replacing my HD.

Have uninstalled iTunes, downloaded a new version (4 times) and keep getting this msg: "iTunes installer completed. The installer encountered errors before it could be configured. Errors occured during installation. Your system has not been modified. Please run installer again o click Finish to exit." Followed by: "A required iTunes component is not installed. Please repair or reinstall iTunes (-42404)." 
I have confirmed that my firewall will allow iTunes to install.
I have tried installing using a different UserID on the same PC.
I don't know where to go from here.
email is [email protected] if you have any ideas.

Many thanks.
Let's try the fixit from the following Microsoft document with that one:
Fix problems with programs that can't be installed or uninstalled

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