If you have Windows, check the hosts file, make sure it's not corrupt.
Computer<C-drive<Windows<System32<drivers<ect<hosts
Open file with notepad, remove all of the gs.apple.com crap, then click save in notepad and X off. If Notepad won't let you save, thats a minor glitch, just move the hosts file to desktop and it will work.
LMK what happens...