I updated my itunes to 10.7 and now my itunes won't work. i have a pc and a toshiba laptop

I updated my itunes today to 10.7 and now neither of my computers will boot up itunes. i have a pc and a Toshiba laptop. they both worked fine until the update. I tried uninstalling and reinstalling but whenb i double click on itunes nothing happens. Any help would be greatly appreciated.
Thanks

Are you getting an error message when you try to launch iTunes? If so, what does it say? (Precise text, please.)

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For a "missing plug-in" error, start with Step 8.
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You might have to log out or restart the computer before a Flash update takes effect.
Step 2
From the Safari menu bar, select
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If you're only having trouble with YouTube videos, log in to YouTube and load this page. You may see a link with the text "Leave the HTML5 Trial." If so, click that link.
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Well, good to meet you. I hope that didn't offend you somehow. I just recognized the name and wondered if you were another fan of the book.
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why dont someone answering gthis ******* problem..

I updated my itunes to 10.7 and now my itunes won't work. i have a pc and a toshiba laptop

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