I just updated my MacBook Pro to 10.7.5 and got a message that the AppleUSBEthernetHost.kext was improperly installed and cannot be used. How to I find and install this extension?

I just updated my MacBook Pro to 10.7.5 and got a message that the AppleUSBEthernetHost.kext was improperly installed and cannot be used. How to I find and install this extension?

Open the AppleScript Editor in the /Applications/Utilities/ folder, copy and paste the entire following line into it, and press the Run button:
do shell script "chown -R root:wheel /System/Library/Extensions/AppleUSBEthernetHost.kext" with administrator privileges
If it doesn’t work, throw that item away and then reinstall iTunes.
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