I just tried to update I tunes and it is totally unusable now

windows erroe 126 --- tried to update itunes today and now I can't open it....

Hi l.elvidge,
Welcome to the Apple Support Communities!
In this situation I suggest you try resetting the device first and trying to continue update.
Turn your iOS device off and on (restart) and reset
http://support.apple.com/kb/ht1430
If that does not resolve your issue, you may need to put the device in recovery mode and restore it from a previous backup after the update installs.
If you can't update or restore your iOS device
http://support.apple.com/kb/ht1808
Have a great day,
Joe

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