I have an article for you that can help you go through that process of uninstalling and reinstalling iTunes. If you have Windows 7, you will want to see this article:
and if you are using Windows XP, you will want to reference this article:
Note that, as it says in those articles:
iTunes Store purchases or songs imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes. While it is highly unlikely that you will lose any contents of your iTunes Library when following these steps, it is always a good idea to ensure that your iTunes library is backed up. If you're unsure how to backup, see iTunes: Back up your iTunes library by copying to an external hard drive.
Thanks for using the Apple Support Communities. Have a good one!