When i try to back up my iphone 4 it says i cannot back it up with the error code -50

when i try to back up my iphone 4 it says i cannot back it up with the error code -50? HELP

If you are running Windows and it stops on the first stage of a sync then my suggestion is to uninstall AppleDeviceSupport version 2.0.1 and re-install 1.5.2.
There are instruction here to do it on Windows 7 (see the first post):
https://discussions.apple.com/thread/3280228?tstart=0
Those instructions are to fix a different problem, but it fixes the problem with syncing devices stopping on the first stage (backing up the device) too. The AppleDeviceSupport 2.0.1 comes with Quicktime 7.7 and, I believe, the latest Safari version.
I'm running XP, so used the Everything search program (http://www.voidtools.com/download.php) to find the directories with the AppleDeviceSupport installers (they have the extension .msi and the version in the directory name) and right-mouse-buttoned them to do the uninstall and install. Note you need a reboot afterwards. (Actually I just sorted out the service in the Service Manager, but that's a longer explaination and a reboot works fine).
Hope that helps,
John

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