IPhone 4 can't synch with itunes 11 (Error -50)

Hi,
I have the latest versions of OS Mavericks, iTunes and on my iPhone 4 but whenever I start iTunes there is a -50 Error that just appears and does nothing, and when I connect my iPhone it says "iPhone cant be synchronized. Unknown error (-50)". It just to work like a month ago before I made that big iPhone update.
I have already tried using different USB cables, repeatedly reinstalled iTunes and also used WiFi-Synch, nothing helped.
Specs: Mac Book Air 11"; 1,4 GhZ Intel Core Duo; 2 GB RAM; From 2010.

Hey kuya,
These are the recommended troubleshooting steps for getting the iTunes error -50:
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 Dock Connector or Lightning Connector to USB 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. An incorrectly set default packet size can cause this error. Contact the software manufacturer that installed the packet-size modification for assistance. Or, follow this article by Microsoft to reset the packet size back to the default for Windows:How to reset Internet Protocol (TCP/IP).
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.
via: iTunes: Specific update-and-restore error messages and advanced troubleshooting
http://support.apple.com/kb/TS3694
Welcome to Apple Support Communities!
Cheers,
Delgadoh

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