Why isn't my iTunes opening on my iPhone 4s

I have just downloaded the ios 7 and my iTunes Store on my phone doesn't want to open! It will open, then 2 seconds later it will close down again! I have installed the new itunes on my PC but it still doesn't open on my phone! Does anybody know why!

Try putting your iPhone in DFU mode (hold down the home button, and sleep button at the same time for ten seconds, ignoring the "slide to power off" bar).

Hope this helped

;C:\program files (x86)\common files\apple\apple application support\

to the end of the system Path as explained here: https://discussions.apple.com/...0&tstart=0

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