Can I recover corrupt iTunes backup?

I backed up my iphone 4s successfully, and I believe the software version was 6.0.0.
The menu button has been knackered for a wee while, and when I took it into the apple store, they thought it easier to just give me a new phone. It's still an iPhone 4s, but it's on software 6.0.1. And the itunes backup is apparently corrupt.
Is there any way of bringing my phone back to its previous software, as I think that is the problem.
Or, is there any way I can view the files and remove the corrupt ones?

Sorry meg, but corrupted files can't be used or fixed as they are damaged

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