ITunes 11.04 errors (-42404, -50, required component not installed)

Help! Following a prompt from Apple SOftware update I just installed the iTunes 11.0.4.4 onto my Windows 7 laptop. SInce then, everything I want to do on iTunes, I can't. I can't connect to my iTunes library stored on my Mac, I can't log into my iTunes account and every time I open iTunes I am told that a required component is not installed and I have to reinstall iTunes. No matter how many times I do this, the problems persist. HAs anyone else had any experience of this and worked out how to fix it?

Hello prawnboy,
An repetitive error like that would definitely get frustrating.  I understand that you have already tried reinstalling iTunes, but I recommend uninstalling the iTunes following the steps in the following article and then trying to reinstall iTunes:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/ht1923
Thank you for using Apple Support Communities.
Best,
Sheila M.

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    HT1925: Removing and Reinstalling iTunes for Windows XP
    HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
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