At the end of the download, it says "unknown publisher"

I continue to try and download Firefox but I keep getting the same message "unknown publisher".
== Operating system ==
XP Home latest version

835ang
What computer operating system is your Premiere Elements 9 running on?
For starters, please go through the Adobe document on damaged (will not open) projects and determine if any of Adobe's suggested troubleshooting there works for you.
Troubleshoot damaged projects | Adobe Premiere Elements
At this point, can you open new projects? For that matter, can you open other saved/closed project, but just not this one project? Depending on your reply, an applicable question might be what happens to the issue with and without the antivirus disabled? Lots other questions about computer and/or program updates.
Thanks. Looking forward to your follow up.
ATR

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After download itunes installation began in windowx xp near the end of the installation the message says: it was not possible to write the value to the key Software / Classes / .mpg / OpenWithList / iTunes / .exe. Already reinstalled 3 times and always sa

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thank you

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How do I download a movie on iTunes on my ipad, because when it gets to the end of the download it says download error tap to retry but when you retry it still doesn't work.

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You can't if you rented and downloaded it on your iPad, you can only watch it on that. From http://support.apple.com/kb/HT1657 :
If you download a rented movie on your computer: You can transfer it to a device such as your Apple TV (1st generation), iPhone, iPad, or iPod if it’s a standard-definition film (movies in HD can only be watched on your computer, iPad, iPhone 4 or later, iPod touch (4th generation or later), or Apple TV). Once you move the movie from your computer to a device, the movie will disappear from your computer's iTunes library. You can move the movie between devices as many times as you wish during the rental period, but the movie can only exist on one device at a time.
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At the end of the download, it says "unknown publisher"

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