Iphone synced with another computer after reinstalling win7

After reinstalling windows 7, itunes states my iphone 4 is synced with another computer and wants to erase all my music and content.

Hi there,
Thanks for that, explains a little. I have changed my operating system to Windows 8 and I am now accessing my library from my back up drive when it was previously accessed on my main drive.
I imagine itunes is seeing another hard drive as in your reply above. If this is the case how can it be resolved? copy my entire library into the itunes music folde as is the default setting?

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    Thanks for that, explains a little. I have changed my operating system to Windows 8 and I am now accessing my library from my back up drive when it was previously accessed on my main drive.
    I imagine itunes is seeing another hard drive as in your reply above. If this is the case how can it be resolved? copy my entire library into the itunes music folde as is the default setting?

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