Problems when updating iTunes

I just updated to iTunes 11.4 and received this pop-up:  The system extension AppleUSBEthernetHost.kext was installed improperly and cannot be used.  What does this mean, what problems will this cause, and how do I resolve?

Hi JodyGia,
If you are having issues with installing iTunes on your Mac, I would suggest that you troubleshoot using the steps in this article -
Troubleshooting iTunes installation on Mac OS X
http://support.apple.com/kb/HT2311
Thanks for using Apple Support Communities.
Best,
Brett L

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