The hosts file is modified to ask SHSH to Cydia. The solution is to delete all lines containing "gs.apple.com". To modify walked into C: WINDOWS / system32 / drivers / etc and open the hosts file giving "double click", then select notepad or notepad and finally we will restart our device.
Having more than 2Gb free hard disk.
Connect the cable to another USB port or use another cable. The USB has to be 2.0
Using another computer or user on the PC (The user preferably newly created).
Update iTunes to the latest version from the official website (It is recommended to uninstall before installing the new version).