ITunes isn't accepting my iPhone?

I want to put music on my phone but when I go to iTunes I get a message telling me that my phone can't be used because it requires iTunes version 11.1 or later. I'm pretty sure I did that already. How can I make sure? ITunes accepts my phone on my computer but it doesn't on my moms computer. Why's that?

Update the itunes on your moms cpu…

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