My iPhone only recognizes some PCS and to restore the error 21

Goodnight all.
I'm having a very strange problem, my iPhone 4, but it carries is not recognized on any mac os, nor on Windows 64-bit, however in windows 32-bit, it is recognized and can even synchronize. However, when I try to restore, it always gives the error 21. Already realized trading dock 30-pin, thinking that it might solve the problem, but so far, it is the same situation. What should I do?
Thank you in advance.

In the article http://support.apple.com/kb/TS3694 it says:
Error 20, 21, 23, 26, 28, 29, 34, 36, 37, 40
These errors typically occur when security software interferes with the restore and update process. FollowTroubleshooting security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See iTunes: Advanced iTunes Store troubleshooting—follow steps under the heading Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store. If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.

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