Updated to 8.2 itunes but now can't open it

Have never had a problem with iTunes until three days ago when I upgraded to the new version, 8.2. Now when I click on the desktop icon, a message appears telling me that iTunes had found an error and has to close, but it never actually opened! I tried reinstalling the new version two different times, but nothing changed. Would really appreciate some help, advice, answers!! Hopefully nothing too complicated!

The first thing you need to do is to check if Quicktime works normally. iTunes cannot work if Quicktime does not.
IF Quicktime is OK, then use this trouble shooting articel of iTunes:
XP
http://support.apple.com/kb/TS1421
Vista version
http://support.apple.com/kb/TS1717
If Quicktime doesn't work, it has to be fixed first.
Have you installed any of the following:
ACE & K-Lite mega codecs package, QT alternative, Storm codec, WinAVI video converter, Mpcstar, (possibly starcodec pack, 3ivx)
If so uninstall them, they are know to cause problems with QUickitme.
Then/otherwise download the version of Quickime without iTunes:
http://www.apple.com/quicktime/download/win.html
Now Remove Quicktime using the method for Quicktime in this article (just Quicktime):
XP
http://support.apple.com/kb/HT1925
Vista
http://support.apple.com/kb/HT1923
When you come to your C:\Windows\system32\ folder you can delete any file or folder with Quicktime in the name.
Restart you computer
Install the stand alone Quicktime and check if it starts.
If it does you are in a position to see if iTunes works

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