unable to activate error 0XE800004 or 2D or 1394 after different compu

I have reset my GSM iphone 4 and now struggling to activate as it comes with different errors from computer to computer and my itunes has been uninstalled and reinstalled and it is the latest version downloaded different ios and still experiencing the problem Errors 0XE800004 or 2D or 1394 it has been two days working on this phone