Everytime i try to update my iphone 3gs it downloads but then cancels halfway but not the full file

Everytime i try to update my iphone 3gs it downloads but then cancels halfway but not the full file. When i download 6.1.3 from various sites i receive an error (3194). I've been trying to troubleshoot it now for weeks. Also i can't copy songs music photo's or anything on it as well. Help would be highly appreciated please and thank you.