(adsbygoogle = window.adsbygoogle || []).push({}); Black ops 2 freezes when I sign in only on this account

It probably means you are banned.

If the game is freezing, and your account isn't banned. It's a problem within the EBOOT you're using which is more than likely modified. Go check out Jewels thread in the Black Ops 2 Mods, Cheats, and Guides section.