IPhone error message in iTunes, frozen iPhone

Bit of background, I have to iPhone 3GS with 4.1.something.
The computer it's synced to is running windows XP.
Two weeks ago my lock button stopped working, I now have to leave it out for a minute to lock (although the button still works when the phone is off and you turn it on).
Just today I tried to unlock my phone when it froze, totally unresponsive.
I tried to reset it, doesnt work with my dodgy button.
I tried to sync it to iTunes, and I get this message:
"iTunes could not connect to iPhone because an invalid response was recieved from the device."
I have the latest iTunes and the apple driver etc...
anyone know how to help me?
Thanks, Levi.
Message was edited by: levvyy

Create a new user account on your mac, delete this app from your phone, you can download it again for free if it is not the culprit. Then log in with that new account, disable autosync in itunes and connect your phone. Transfer your purchases by right clicking on your phone in the device list and choosing "transfer purchases". Then try to move some apps on your iphone screen and sync afterwards. If you're having no problems doing this, the app you where talking about was the culprit.
Make sure your data is backed up before

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