-50 error when updating iphone???

Hi everyone,
I'm trying to update/back-up my iPhone 4 to the latest version. I've been sucessful in updating itunes, however, when I try to update my phone, the (-50 error message appears. It gives me the option to continue or cancel. It warns me that if I continue, it will delete all content. I'm concerned I will lose everything if I continue".
If anyone has any step by step information on how to fix , it would be greatly appreciated!
Thanks,
jamiefromon

If you have a backup stored in itunes you have nothing to worry about if not just right on you iphone under device and choose backup.
As far as the error message goes if you search that message (-50) on http://support.apple.com/kb/TS3694 it refers you to errors 13 and 14 which states
These errors are typically resolved by performing one or more of the steps listed below:
Perform USB isolation troubleshooting, including trying a different USB port directly on the computer. See the advanced steps below for USB troubleshooting.
Put a USB 2.0 hub between the device and the computer.
Try a different USB 30-pin dock-connector cable.
Eliminate third-party security software conflicts.
There may be third-party software installed that modifies your default packet size in Windows by inserting one or more TcpWindowSize entries into your registry. Your default packet size being set incorrectly can cause this error. Contact the manufacturer of the software that installed the packet-size modification for assistance. Or, follow this article by Microsoft: How to reset Internet Protocol (TCP/IP) to reset the packet size back to the default for Windows.
Connect your computer directly to your Internet source, bypassing any routers, hubs, or switches. You may need to restart your computer and modem to get online.
Try to restore from another known-good computer and network.
Hope that works for you

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