iphone 4 common error

I have iphone 4 he was work but I decided to update to ios7.0.4 but on PC keep telling me that error 3194 and on mac either 3004 or this message ((the iphone could not be restored this device isn't eligible for the requested build) and on both I checked the host file and I delete it and anty vairuos is off on pc why gaus .......what should I do :confused:

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