Help! Tried to upgrade to latest iOS firmware (4.3.5) and I get an error "Unknown error occured (1394)" What do I do now?

Everything was fine, I try to update to latest iOS firmware (4.3.5) and I get an error "Unknown error occured (1394)" What do I do now?
Can anyone help me?
Bobby

Error 3194, AKA "This device is not eligible.. occurs for several reasons:
1.  Update to the latest iTunes - currently 10.4.1.
2.  Disable ALL security apps (firewall, antivirus/spyware) running on your computer.  Additional measures may be needed.
3.  You may need to edit the Hosts file on your computer to remove references to gs.apple.com if you EVER used hacking techniqus or apps such as tinyumbrella.
4. Don't try to downgrade the iOS.
5.  If the phone was EVER successfully hacked in the past (jailbreak, downgrade, unauthourized unlock) there may be nothing you can do now to fix this.
"This device is not eligible for the requested build: Also sometimes displayed as an error 3194. If you receive this error, update to the latest version of iTunes. 3rd party security software or router security settings can also cause this issue, to resolve please follow Troubleshooting security software issues. Downgrading to a previous version of iOS is not supported. If you have installed software to perform unauthorized modifications to your iOS device, that software may have redirected connections to the update server (gs.apple.com) within the Hosts file. For steps to edit the Hosts file and allow iTunes to communicate with the update server, see  iTunes: Troubleshooting iTunes Store on your computer, iPhone, iPad, or iPod; follow steps under the heading Blocked by configuration (Mac OS X / Windows) > Rebuild network information > The hosts file may also be blocking the iTunes Store.  Also, using an older or modified .ipsw file can cause this error. Try restoring moving the current .ipsw file aside, or try restoring in a new user to ensure that iTunes downloads a new .ipsw."
http://support.apple.com/kb/TS3694

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