I'm getting this message when I try to open iTunes: This copy of iTunes is corrupted or is not installed correctly. Please reinstall iTunes. (-42037) What do I do?

I'm getting this message when I try to open iTunes: This copy of iTunes is corrupted or is not installed correctly. Please reinstall iTunes. (-42037) What do I do?

Do a back up then try reinstalling.
You should always back up before do an update, upgrade, anything with the system in case something goes wrong. That way you still have a current copy of your data.
Try starting in safe mode, then running the update. This will disable most 3rd party sofwarelike anti virus and other things prople put on their machines that can cause problems.
Safe mode:
Power off, power on holding the shift key, continue to hold until you see the progress BAR then re;ase and allow to finish booting. Note this will take longer than a regular boot. Login and try running software update or use the link here to download. Use an ethernet connection if possible as it is much less prone to corruption than wireless.
http://support.apple.com/kb/DL1614
After download and install logout and restart normally.

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