Error -4 when syncing my iPhone

When syncing my iPhone 4s it gets to copy new files to my phone and stops, an error message then appears which says "iPhone cannot be synced, unknown erorr occured -4" can anybody please tell me how to fix this?

Hello Sid Underwood,
Thank you for using Apple Support Communities.
For more information, take a look at:
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694#4
Configure your security software
Related errors: 2, 4, 6, 9, 1000, 1611, 9006, 9807, 9844. Sometimes as a result of this issue, a device might stop responding during the restore process.
Check your security software and settings, which can block ports and prevent connection to Apple servers during update and restore.
Have a nice day,
Mario

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