Hey there AndyB999,
It sounds like you are getting this error message when installing iTunes 11.1.4 on your computer. This error message is mentioned in the following article:
iTunes 11.1.4 for Windows: Unable to install or open
http://support.apple.com/kb/TS5376
"Runtime Error: R6034 - An application has made an attempt to load the C runtime library incorrectly"
Follow these steps to resolve the issue:
- Go to C:\Program Files (x86)\iTunes and C:\Program Files\iTunes and look for .dll files.
- If you find QTMovie.DLL, or any other .dll files, move them to the desktop.
- Reboot your computer.
Note: Depending on your operating system, you may only have one of the listed paths.
- Uninstall iTunes and all of its related components.
- Reboot your computer. If you can't uninstall a piece of Apple software, try using the Microsoft Program Install and Uninstall Utility.
- Re-download and reinstall iTunes 11.1.4.
Part of the troubleshooting does involve re installing iTunes again, but the article linked therein will show how to uninstall iTunes and its associated programs as well for a clean install.
Thank you for using Apple Support Communities.
Cheers,
Sterling