HT4623 Itunes update failed; tried to reinstall; get error message that I need to confirm I have authority to run the program?

I plugged my iPad to my computer this morning and it said there was a new version of IOS available. Tried to install.
Install failed.
Now itunes won't open:  "The program can't start because MSVCR80.dll is missing from your computer. Try reinstalling the program to fix this problem."
Went to www.itunes.com, downloaded and tried to install.  Install failis saying I need to verify that I have credentials to run the program. Choices: Abort, Try again, Ignore.  Needless to say the only choice that works in Abort, so I can't connect my iPad to iTunes.
Is there a way to uninstall the program and then try again?
Or other fix?

How To Completely Uninstall and Remove All Traces of iTunes
http://zardozz.com/zz/2008/04/how-to-completely-uninstall-and-remove-all-traces- of-itunes.html/
If you can't update or restore your iOS device
http://support.apple.com/kb/ht1808http://support.apple.com/kb/ht1808
 Cheers, Tom

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