Windows Installer cleanup utility is no longer available for download from Microsoft. It was found to damage other components and should not be used.
With that said, it would be best to post this issue in the Apple discussion forums for assistance.
Delete all Apple products from your computer.
See: http://support.apple.com/kb/HT1925
Use the Control Panel to uninstall iTunes and related software components in the following order:
- iTunes
- QuickTime
- Apple Software Update
- Apple Mobile Device Support
- Bonjour
- Apple Application Support (iTunes 9 or later)
Then download and install the latest version of iTunes for your operating system.
Please reply back and let us know if this helps.
Thanks,
Marilyn