Unable to upgrade iTunes -- please help! ...

Hi there -

I am having trouble upgrading to iTunes 9.0.2

It comes up with a message saying something along the lines of:
the older version of itunes cannot be removed, please contact tech support

contacting tech support is unfortunately even more long-winded than copying all my music into a new folder, manually deleting all reminents of my old iTunes and then downloading the newest iTunes, so if anyone's got any ideas about what's causing this to happen or any way to fix the problem in a simple way, then all help is greatly appreciated

Thanks

Nikki

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