Question : Problem: How to install iTunes

I've used iTunes for several years and have regularly upgraded. This time I decided on a clean re-install but whenever I try I immediately get this message: The installer encountered errors before iTunes could be configured. Your system has not been modified. To retry these operations at a later time, please run the installer again. I've cleaned my registry after trying to uninstall a previous version and have run Windows Washer to clean old unnecessary files. I've searched this issue on Google and have found that I'm not alone.

Answer : Problem: How to install iTunes

Download and run the Microsoft Installer Cleanup utility and then install iTunes again, it will work.

http://support.microsoft.com/kb/290301