My itunes says it hasn't updated een though I updated it?

I went to update my iphone and it said I had to update my itunes first and restart my computer (i have a macbook.) So I did all that and went to try and update my phone again and it still said I had to update my itunes first so I did it again and it is still not allowing me to update my iphone. It still says I need the latest version of itunes. What am I do wrong!

The problem is a bit complicated to explain, but here goes:
You are not using the latest version.

Are you using an old computer and the same old OS that came on it? The solution is to buy a new OS and install it. You need OS 10.5.8 or later to use the latest version of iTunes.

You can see this yourself:
-- Go to the link below.
-- Read what is required…
"Macintosh Hardware
* Mac computer with an Intel, PowerPC G5 or G4 processor and 512MB of RAM
* To play Standard Definition video from the iTunes Store, a 1.0GHz PowerPC G4 or faster processor and 512MB of RAM is required
* To play 720p HD video, an iTunes LP, or iTunes Extras, a 2.0GHz Intel Core 2 Duo or faster processor and 1GB of RAM is required.
* To play 1080p HD video, a 2.4GHz Intel Core 2 Duo or faster processor and 2GB of RAM is required.
* Screen resolution of 1024x768 or greater; 1280x800 or greater is required to play an iTunes LP or iTunes Extras
* Broadband Internet connection to use the iTunes Store
* Apple combo drive or SuperDrive to create audio, MP3, or back-up CDs; some non-Apple CD-RW recorders may also work
* Apple SuperDrive to back up your library to DVDs; some non-Apple DVD-RW drives may also work

Macintosh Software
* Mac OS X version 10.5.8 or later
* Safari 4.0.3 or later
* 200MB of available disk space
* iTunes in the Cloud and iTunes Match availability may vary by country.

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