Can't open iTunes on my pc - Windows error 127

All of a sudden I am unable to open iTunes on my pc - i get the above error message - windows error 127 please reinstall iTunes.
I am worried that I will lose some or all of my music and apps - has anyone else had this problem?

Hi joolyjools,
Welcome to the Apple Support Communities! I understand that you are getting an alert that informs you to reinstall iTunes on your computer and you are concerned for your music and apps. If you delete iTunes and reinstall fresh you shouldn’t lose any content from the iTunes Library because the content is not actually stored in the iTunes program. The following article will assist you uninstalling iTunes and its components. After the uninstall, make sure to restart your computer and then you can download iTunes fresh from the Apple website.
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
http://support.apple.com/kb/ht1923
1. Remove iTunes and related components from the Control Panel
Use the Control Panel to uninstall iTunes and related software components in the following order and then restart your computer:
iTunes
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support (iTunes 9 or later)
Important: Uninstalling these components in a different order, or only uninstalling some of these components may have unintended affects.
I hope this helps,  
-Joe

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