I downloaded the latest version and now firefox won't open at all on my mac laptop

Macbook Pro 10.6.7
Tried to download 4.0 - it is incomplete

Hello, discodiva64
Thank you for the question. Try uninstalling all components of iTunes in the order specified of the article below. Once this is done attempt to install iTunes again.
Removing and Reinstalling iTunes and other software components for Windows XP
http://support.apple.com/kb/ht1925
If the issue persists, I would recommend going through these steps for error 7.
iTunes for Windows: "Error 7" message when opening iTunes
http://support.apple.com/kb/ts3074
If the issue still persists, you may need to process the steps in the article below for each component when uninstalling iTunes.
"The feature you are trying to use is on a network resource that is unavailable" alert when removing Apple software in Windows
http://support.apple.com/kb/TS3704
Cheers,
Jason H.

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