The iPhone cannot by synced. An unknown error occurred (-4).

I'm trying to sync my iPhone with iTunes.
I keep getting the error message - The iPhone cannot by synced. An unknown error occurred (-4).
Using:
iTunes 12.1.1
iPhone 5s iOS 8.2
Desktop PC, Windows 7
I have already tried:
uninstalling iTunes and reinstalling it
resetting iPhone
Anyone know how to resolve this issue?
Please help. Thank you!

Thanks for the reply!
I disabled all antivirus/antispyware and it's still not working. Doesn't sync and same error message received.

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The iPhone cannot by synced. An unknown error occurred (-4).

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