ITunes 7 Unknown Error Msg (-200)

I have downloaded iTunes 7, but everytime I try to open it, I get this error message:
"The iTunes application could not be opened. An unknown error occurred (-200)."
I don't know what to do! Any suggestions?

"The iTunes application could not be opened. An unknown error occurred (-200)."
the -200 is caused by a problem with your QuickTime. (iTunes needs a fully functional QuickTime in order to work properly.)
the first thing we'll try is a careful standalone QT 7.1.3 reinstall.
download and save a copy of the QT 7.1.3 standalone installer to your hard drive. (we'll run the install from there rather than online.) switch off antivirus and antispyware applications prior to the install.
Quicktime 7.1.3 Installers … get the one that doesn’t mention itunes
if that install goes through okay, does your itunes launch properly again?
(if you get an error message on the QT standalone reinstall, let us know what it says. include error message numbers if you're getting any.)

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    Try:                                               
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    Hi Laura-Wedders,
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    On August 7th, some users may have been unable to make purchases from the App Store, iTunes Store, Mac App Store, or iBookstore. Apple worked quickly to resolve these issues, however you may have experienced them.
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    iTunes: Advanced iTunes Store troubleshooting
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