Computer slow and not responding since installation of new iTunes update

Good Morning,
I downloaded the new iTunes update two days ago. As soon as I did it my computer was freezing up and none of my programs would respond. I uninstalled it as my computer was working fine. I did the update again and the same thing happened. So this time I uninstalled iTunes only, not Quick Time and my computer is fine. Is there anyway I can get a link to download the previous version? I can not do a system restore because my compute does not have one for some reason. I have tried that.
Also my computer's CPU usage runs normally at anywhere from 4% to 12%, both times after I did the update, it was running at 100% all the time. I could not shut it off or close any programs.
Does anybody have any ideas?
Thank you for your time.

Many thanks Matt - when I spoke to my son last night he did say the anti-virus programme might be the cause, so he told me how to re-install the old Thunderbird version which worked, and to tick the option which says 'allow me to choose whether to install new versions'. So far so good! Very grateful for your help - thanks.

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Re: iTunes has stopped working. Why?
Sep 11, 2013 6:07 AM (in response to thurdy)
Resolved!
After contacting Apple, I received a reply from their engineers:
Copy QTMovieWin.dll from: C:\Program Files (x86)\Common Files\Apple\Apple Application Support
to: C:\Program Files (x86)\iTunes
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Message was edited by: Stryder777

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Computer slow and not responding since installation of new iTunes update

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